2024/04/30 更新

写真a

ヤツハシ トモユキ
八ッ橋 知幸
YATSUHASHI Tomoyuki
担当
大学院理学研究科 化学専攻 教授
理学部 化学科
職名
教授
所属
理学研究院
ホームページ
所属キャンパス
杉本キャンパス

担当・職階

  • 大学院理学研究科 化学専攻 

    教授  2022年04月 - 継続中

  • 理学部 化学科 

    教授  2022年04月 - 継続中

取得学位

  • 博士(工学) ( 東京都立大学 )

  • 修士(工学) ( 東京都立大学 )

研究分野

  • ナノテク・材料 / 基礎物理化学  / 高強度レーザー化学

  • ナノテク・材料 / ナノ材料科学  / 金属・炭素ナノ粒子

  • ナノテク・材料 / 分析化学

研究キーワード

  • ナノ粒子

  • クーロン爆発

  • 多価分子カチオン

  • フェムト秒レーザー

  • 質量分析

  • 物理化学

  • 多価イオン

  • 分析化学

  • 光化学

  • レーザー化学

  • ナノ粒子

研究概要

  • 1)多価カチオンの化学:多価分子カチオン生成とクーロン爆発
    2)ナノ粒子の化学:トップダウンおよびボトムアップレーザープロセスによるナノ粒子生成

研究歴

  • トップダウンおよびボトムアップレーザープロセスによるナノ粒子生成

    2011年10月 - 継続中 

  • 分子内電荷移動励起状態の水素結合相互作用による無幅射失活過程

    水素結合、無幅射失活  国際共同研究

    1900年04月 

  • ホット分子の1光子及び多光子反応に関する研究

    ホット分子  機関内共同研究

    1900年04月 

  • 超短パルス超高強度レーザーと分子の相互作用

    フェムト秒レーザー、超高強度レーザー、クーロン爆発  国内共同研究

    1900年04月 

所属学協会

  • 日本化学会

      国内

  • 光化学協会

      国内

  • 日本質量分析学会

  • 強光子場科学研究懇談会

  • 分子科学会

委員歴(学外)

  • 近畿支部幹事   日本化学会  

    2007年 - 継続中 

  • 理事   光化学協会  

    2014年 - 2016年12月 

  • 幹事   強光子場化学研究懇談会  

    2013年10月 - 2017年10月 

  • サステナブル・先端応用へ向けたレーザプロセシング技術調査専門委員会 委員   電気学会  

    2011年12月 - 2014年11月 

  • 代表正会員   日本化学会  

    2009年03月 - 2011年03月 

受賞歴

  • 平成29年度「科研費」審査委員表彰

    2017年09月   日本学術振興会  

  • BCSJ (The Bulletin of the Chemical Society of Japan) 賞

    2015年02月  

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    受賞国:日本国

  • The APA Prize for Young Scientists, 2009-2010

    八ッ橋 知幸

    2010年11月  

  • 日本化学会第89春期年会 若い世代の特別講演証

    八ッ橋 知幸

    2009年03月  

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    受賞国:日本国

  • The APLS Young Scientist Prize

    八ッ橋 知幸

    2008年02月  

  • 光化学協会奨励賞

    八ッ橋 知幸

    2007年09月  

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    受賞国:日本国

  • アレクサンダー・フォン・フンボルト財団研究奨励金

    八ッ橋 知幸

    2002年03月  

▼全件表示

職務経歴(学外)

  • 科学技術振興機構 戦略的創造研究推進事業さきがけ   「光の利用と物質材料・生命機能」領域   個人研究者

    2009年10月 - 2013年03月

  • ドイツ連邦共和国 マックス・プランク量子光学研究所   客員研究員

    2002年01月 - 2003年03月

学歴

  • 東京都立大学   工学研究科   工業化学   博士課程  

    - 1998年

  • 東京都立大学   工学部   工業化学    

    - 1993年

論文

  • Multiple ionization and Coulomb explosion of molecules, molecular complexes, clusters and solid surfaces 招待 査読

    Yatsuhashi Tomoyuki, Nakashima Nobuaki

    JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS   34   52 - 84   2018年03月( ISSN:1389-5567

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    担当区分:筆頭著者   掲載種別:研究論文(学術雑誌)   共著区分:共著   国際・国内誌:国際誌  

    DOI: 10.1016/j.jphotochemrev.2017.12.001

  • Charge-Dependent Metastable Dissociations of Multiply Charged Decafluorobiphenyl Formed by Femtosecond Laser Pulses

    Kitagawa K.

    Mass Spectrometry   12 ( 1 )   A0130 - A0130   2023年10月( ISSN:2187137X

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  • Fabrication of FeCoNi medium-entropy alloy nanoparticles by high-repetition-rate UV picosecond laser ablation in water

    Watanabe A.

    Journal of Alloys and Compounds   950   2023年07月( ISSN:09258388

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  • Laser-fluence dependence of resonance-enhanced multiphoton reduction of trivalent europium

    Matsuda S.

    Chemical Physics Letters   802   2022年09月( ISSN:00092614

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  • Reduction and precipitation of aqueous europium (III) under an air atmosphere by near-infrared femtosecond laser pulses

    Tamejima K.

    Journal of Photochemistry and Photobiology A: Chemistry   427   2022年05月( ISSN:10106030

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  • フェムト秒レーザーイオン化による多価分子イオン生成

    八ッ橋 知幸

    質量分析   70 ( 1 )   24 - 29   2022年03月( ISSN:13408097

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  • 液-液界面を利用する均一粒径金属ナノ粒子のレーザー合成

    八ツ橋 知幸

    光学   51   61 - 67   2022年

  • フェムト秒レーザーイオン化による多価分子イオン生成 査読

    八ツ橋 知幸

    J. Mass Spectrom. Soc. Jpn.   70   24 - 29   2022年

  • Smallest Organic Tetracation in the Gas Phase: Stability of Multiply Charged Diiodoacetylene Produced in Intense Femtosecond Laser Fields

    Kawaguchi T.

    Journal of Physical Chemistry A   125 ( 36 )   8014 - 8024   2021年09月( ISSN:10895639

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  • Cooperative dissociation of J -aggregates into monomers in the 2-isobutoxyethanol/water binary solvent with the lower critical solution temperature

    Harada Mio, Yamamoto Shunsuke, Yatsuhashi Tomoyuki, Sakota Kenji

    CHEMICAL PHYSICS   536   2020年08月( ISSN:0301-0104

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  • Cooperative dissociation of J-aggregates into monomers in the 2-isobutoxyethanol/water binary solvent with the lower critical solution temperature

    Harada M.

    Chemical Physics   536   2020年08月( ISSN:03010104

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  • An electron-capture efficiency in femtosecond filamentation

    Nakashima Nobuaki, Yatsuhashi Tomoyuki, Sakota Kenji, Iwakura Izumi, Hashimoto Sena, Yokoyama Keiichi, Matsuda Shohei

    CHEMICAL PHYSICS LETTERS   752   2020年08月( ISSN:0009-2614

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  • An electron-capture efficiency in femtosecond filamentation

    Nakashima N.

    Chemical Physics Letters   752   2020年08月( ISSN:00092614

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  • Synthesis of iron-based nanoparticles from ferrocene by femtosecond laser irradiation: Suppression of the particle growth in a mixture of water and hexane

    Horikawa Yuki, Okamoto Takuya, Nakamura Takahiro, Tahara Yuhei O., Miyata Makoto, Ikeda Shingo, Sakota Kenji, Yatsuhashi Tomoyuki

    CHEMICAL PHYSICS LETTERS   750   2020年07月( ISSN:0009-2614

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  • Synthesis of iron-based nanoparticles from ferrocene by femtosecond laser irradiation: Suppression of the particle growth in a mixture of water and hexane

    Horikawa Y.

    Chemical Physics Letters   750   2020年07月( ISSN:00092614

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  • Charge Transfer and Metastable Ion Dissociation of Multiply Charged Molecular Cations Observed by Using Reflectron Time-of-Flight Mass Spectrometry

    Kitashoji Akihiro, Kitagawa Kosei, Fujihara Akimasa, Yatsuhashi Tomoyuki

    CHEMPHYSCHEM   21 ( 9 )   847 - 852   2020年05月( ISSN:1439-4235

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  • Charge Transfer and Metastable Ion Dissociation of Multiply Charged Molecular Cations Observed by Using Reflectron Time-of-Flight Mass Spectrometry

    Kitashoji A.

    ChemPhysChem   21 ( 9 )   847 - 852   2020年05月( ISSN:14394235

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  • Charge Transfer and Metastable Ion Dissociation of Multiply Charged Molecular Cations Observed by Using Reflectron Time-of-Flight Mass Spectrometry

    Kitashoji A.

    Chemphyschem : a European journal of chemical physics and physical chemistry   21 ( 9 )   2020年05月

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  • Effects of Ligand and Solvent on the Synthesis of Iron Oxide Nanoparticles from Fe(acac)3 Solution by Femtosecond Laser Irradiation

    Okamoto T.

    Chemistry Letters   49 ( 1 )   75 - 78   2020年01月( ISSN:03667022

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  • Effects of Ligand and Solvent on the Synthesis of Iron Oxide Nanoparticles from Fe(acac)(3) Solution by Femtosecond Laser Irradiation

    Okamoto Takuya, Nakamura Takahiro, Tahara Yuhei O., Miyata Makoto, Sakota Kenji, Yatsuhashi Tomoyuki

    公益社団法人 日本化学会 CHEMISTRY LETTERS   49 ( 1 )   75 - 78   2020年01月( ISSN:0366-7022

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    <p>Synthesis of iron oxide nanoparticles (Fe-O NPs) from iron(III)acetylacetonate solution by femtosecond laser irradiation is reported. Fe-O NPs and carbon are agglomerated in <i>n</i>-hexane, while single-nanometer-sized dispersed Fe-O NPs are obtained in water. We propose that the choice of ligands and solvent determines the primary particle size distribution and dispersion states of NPs as well as carbon contaminants in laser-assisted synthesis using metal complexes as reactants.</p>

    DOI: 10.1246/cl.190751

    CiNii Article

  • Multiply charged energetic metal ion emissions from dinuclear metal complex exposed to intense femtosecond laser fields

    Matsumoto Takuya, Tanaka Hiroki, Nakashima Nobuaki, Yatsuhashi Tomoyuki

    INTERNATIONAL JOURNAL OF MASS SPECTROMETRY   447   2020年01月( ISSN:1387-3806

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  • Multiply charged energetic metal ion emissions from dinuclear metal complex exposed to intense femtosecond laser fields

    Matsumoto T.

    International Journal of Mass Spectrometry   447   2020年01月( ISSN:13873806

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  • 有機金属錯体溶液のレーザプロセッシングによる金属ナノ粒子の合成法研究

    八ッ橋 知幸

    天田財団助成研究成果報告書   33 ( 0 )   349   2020年( ISSN:24340723

  • The smallest aromatic tetracation produced in gas phase by intense femtosecond laser pulses

    Kitashoji A.

    Chemistry Letters   48 ( 12 )   1472 - 1475   2019年12月( ISSN:13480715

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  • The Smallest Aromatic Tetracation Produced in Gas Phase by Intense Femtosecond Laser Pulses

    Kitashoji Akihiro, Fujihara Akimasa, Yoshikawa Taiki, Yatsuhashi Tomoyuki

    公益社団法人 日本化学会 CHEMISTRY LETTERS   48 ( 12 )   1472 - 1475   2019年12月( ISSN:0366-7022

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    芳香族フッ素化合物にフェムト秒レーザーを照射することで、芳香族化合物では最も小さい4価陽イオン(ヘキサフルオロベンゼン、C6F6)を生成することに成功しました。イオンの検出には飛行時間型質量分析計を用い、イオンの飛行時間からイオンのm/zを決定しました。さらに、同位体ピークの面積比から元素組成を決定しました。このような多価陽イオンを生成することができた理由として、フェムト秒レーザーを用いるトンネルイオン化によって生じるイオンが余剰なエネルギーをもたないこと、プロトンとして容易に脱離する水素原子をフッ素原子で置換したことが挙げられます。今回、フェムト秒レーザーを用いることで芳香族4価陽イオンについて分子サイズの最小値を34年ぶりに更新しました。その一方で、リフレクトロンを用いて、4価ヘキサフルオロベンゼンの寿命の下限値を9マイクロ秒と見積もりました。ヘキサフルオロベンゼンについては、高速イオン選別器を用いて価数別にイオンを選別し、解離で生じる生成物をリフレクトロンによって分離する事で価数ごとの反応の観測を試みました。しかしながら、検出感度を限界まで上げても生成物は観測されませんでした。多価陽イオンが単独では極めて安定であることが明らかになりましたので、これまで未知であった多価陽イオンの物性や反応の研究が可能であるといえます。また、多価陽イオンのサイズが十分に小さくなったため理論研究にも取り組みやくなったといえます。これらの課題については、引き続き研究を進めていくつもりです。(参照: LINK1)

    DOI: 10.1246/cl.190667

    CiNii Article

  • Definitive production of intact organic pentacation radical: Octafluoronaphthalene ionized in intense femtosecond laser fields

    Kitashoji Akihiro, Yatsuhashi Tomoyuki

    CHEMICAL PHYSICS   526   2019年10月( ISSN:0301-0104

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  • Definitive production of intact organic pentacation radical: Octafluoronaphthalene ionized in intense femtosecond laser fields

    Kitashoji A.

    Chemical Physics   526   2019年10月( ISSN:03010104

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  • Synthesis of Single-Nanometer-Sized Gold Nanoparticles in Liquid-Liquid Dispersion System by Femtosecond Laser Irradiation

    Okamoto Takuya, Nakamura Takahiro, Sakota Kenji, Yatsuhashi Tomoyuki

    LANGMUIR   35 ( 37 )   12123 - 12129   2019年09月( ISSN:0743-7463

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  • Synthesis of Single-Nanometer-Sized Gold Nanoparticles in Liquid-Liquid Dispersion System by Femtosecond Laser Irradiation

    Okamoto T.

    Langmuir   35 ( 37 )   12123 - 12129   2019年09月( ISSN:07437463

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  • Multiple strong field ionization of metallocenes: Applicability of ADK rates to the production of multiply charged transition metal (Cr, Fe, Ni, Ru, Os) cations

    Murakami Eri, Mizoguchi Ryuji, Yoshida Yusuke, Kitashoji Akihiro, Nakashima Nobuaki, Yatsuhashi Tomoyuki

    JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY   369   16 - 24   2019年01月( ISSN:1010-6030

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  • Multiple strong field ionization of metallocenes: Applicability of ADK rates to the production of multiply charged transition metal (Cr, Fe, Ni, Ru, Os) cations

    Murakami E.

    Journal of Photochemistry and Photobiology A: Chemistry   369   16 - 24   2019年01月( ISSN:10106030

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  • Synthesis of Bare Iron Nanoparticles from Ferrocene Hexane Solution by Femtosecond Laser Pulses 査読

    Takuya Okamoto, Takahiro Nakamura, Ryo Kihara, Tsuyoshi Asahi, Kenji Sakota, Tomoyuki Yatsuhashi

    ChemPhysChem   19 ( 19 )   2480 - 2485   2018年10月( ISSN:1439-4235

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    担当区分:最終著者, 責任著者   掲載種別:研究論文(学術雑誌)  

    © 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Iron-based nanoparticles (FeNPs) have unique and attractive properties such as superparamagnetism, biocompatibility, and catalytic activity. Although the synthesis of precious metal NPs from a metal in liquid and/or metal salt solution by a pulsed laser has been investigated, comparably little effort has been devoted to examine the production of FeNPs. Here we report the synthesis of carbon-shell free spherical NPs of iron oxide (magnetite) from ferrocene hexane solution by femtosecond near infrared laser pulses. Nanosecond UV laser pulses are used to compare the evolution of the particle size distribution as a function of laser irradiation time. The size of NPs remains constant even for extended exposure to femtosecond laser pulses, whereas it grows with exposure to nanosecond laser pulses. The primary particles are generated by photochemical reactions regardless of pulse duration; however, the fragmentation of NPs by successive femtosecond laser pulses regulates the particle size.

    DOI: 10.1002/cphc.201800436

    PubMed

  • Synthesis of Bare Iron Nanoparticles from Ferrocene Hexane Solution by Femtosecond Laser Pulses

    Takuya Okamoto, Takahiro Nakamura, Ryo Kihara, Tsuyoshi Asahi, Kenji Sakota, Tomoyuki Yatsuhashi

    Wiley ChemPhysChem   19 ( 19 )   2480 - 2485   2018年10月( ISSN:1439-4235

  • Coulomb explosion of a series of alpha, omega-diiodoalkanes in intense laser fields

    Itsukashi Masako, Nakashima Nobuaki, Yatsuhashi Tomoyuki

    JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY   364   116 - 123   2018年09月( ISSN:1010-6030

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  • Coulomb explosion of a series of α ω-diiodoalkanes in intense laser fields 査読

    Masako Itsukashi, Nobuaki Nakashima, Tomoyuki Yatsuhashi

    Journal of Photochemistry and Photobiology A: Chemistry   364   116 - 123   2018年09月( ISSN:1010-6030

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    担当区分:最終著者, 責任著者   掲載種別:研究論文(学術雑誌)  

    © 2018 Elsevier B.V. The kinetic energy of ions produced by a Coulomb explosion, in which multiply charged molecular cations dissociate, is determined by the charge number, mass, and geometric configuration of the ions upon explosion. Although the importance of the structural deformation and migration of atoms on kinetic energy variations is well known, there has been little investigation into the effect of charge localization before the ions are released. In this study, the angular distributions of iodine and carbon ions ejected from linear alkanes, which have one iodine atom on each side of an alkyl chain having one to six carbon atoms, are measured. The highly charged iodine ions (I4+, I5+) are emitted mostly along the laser polarization direction, whereas the angular distribution of iodine ions becomes isotropic the longer the alkyl chain and the lower the charge number of iodines are. Furthermore, the longer the alkyl chain, the higher the kinetic energy of iodine and carbon ions. The emission of ions is discussed in terms of the selective ionization of aligned molecules based on their molecular orbitals. The charge localization during ionization in strong alternating electric fields followed by two-body Coulomb explosion via a C–I bond cleavage is proposed.

    DOI: 10.1016/j.jphotochem.2018.06.006

  • Eluent-assisted Nonresonant Multiphoton Ionization of Polycyclic Aromatic Hydrocarbons in a Liquid Chromatograph-mass Spectrometer

    Oya Naoki, Yatsuhashi Tomoyuki

    公益社団法人 日本化学会 CHEMISTRY LETTERS   47 ( 8 )   1014 - 1017   2018年08月( ISSN:0366-7022

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    <p>A sub-nanosecond visible laser coupled with a liquid chromatograph is utilized for atmospheric pressure laser ionization (APLI). We reveal that the range of applicable substances for nonresonant three-photon ionization is determined by the proton affinity and the ionization potential, the latter of which is lowered by solvation with eluents. APLI with a visible laser can be used for fragmentation- and background-free detection of analytes as well as to investigate the ionization threshold of solvated molecules.</p>

    DOI: 10.1246/cl.180379

    CiNii Article

  • Multiple ionization and Coulomb explosion of molecules, molecular complexes, clusters and solid surfaces 査読

    Tomoyuki Yatsuhashi, Nobuaki Nakashima

    Journal of Photochemistry and Photobiology C: Photochemistry Reviews   34   52 - 84   2018年03月( ISSN:1389-5567

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    担当区分:筆頭著者, 責任著者  

    © 2017 Elsevier B.V. Intense femtosecond lasers as well as X-ray free electron lasers provide new means to produce multiply charged molecular cations. The fragmentation processes that these high energy species undergo, termed Coulomb explosion, are utilized to determine the static molecular structures as well as to trace the molecular dynamics of ultrafast chemical reactions. This review focuses on recent advances made in studies of Coulomb explosion imaging, highlighting the use of this process to determine the static structures of complex molecules, geometric isomers, chiral molecules and molecular complexes. Briefly, we summarize the recent time-resolved studies of surface electric fields and the controversy pertaining to the contribution of Coulomb explosion to the mechanism for ablation of solid surfaces.

    DOI: 10.1016/j.jphotochemrev.2017.12.001

  • Eluent-assisted nonresonant multiphoton ionization of polycyclic aromatic hydrocarbons in a liquid chromatograph-mass spectrometer 査読

    Naoki Oya, Tomoyuki Yatsuhashi

    Chemistry Letters   47 ( 8 )   1014 - 1017   2018年( ISSN:0366-7022

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    担当区分:最終著者, 責任著者   掲載種別:研究論文(学術雑誌)  

    © 2018 The Chemical Society of Japan. A sub-nanosecond visible laser coupled with a liquid chromatograph is utilized for atmospheric pressure laser ionization (APLI). We reveal that the range of applicable substances for nonresonant three-photon ionization is determined by the proton affinity and the ionization potential, the latter of which is lowered by solvation with eluents. APLI with a visible laser can be used for fragmentation- and background-free detection of analytes as well as to investigate the ionization threshold of solvated molecules.

    DOI: 10.1246/cl.180379

    CiNii Article

  • Selection of a Single Isotope of Multiply Charged Xenon (Xe-A(z+), A=128-136, z=1-6) by Using a Bradbury-Nielsen Ion Gate 査読

    Kitashoji Akihiro, Yoshikawa Taiki, Fujihara Akimasa, Kamamori Takaaki, Nashima Shigeki, Yatsuhashi Tomoyuki

    Wiley-Blackwell CHEMPHYSCHEM   18 ( 15 )   2007 - 2011   2017年08月( ISSN:1439-4235

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/cphc.201700381

    その他URL: http://orcid.org/0000-0002-6810-7774

  • Selection of a Single Isotope of Multiply Charged Xenon (<sup>A</sup>Xe<sup>z+</sup>, A=128–136, z=1–6) by Using a Bradbury–Nielsen Ion Gate 査読

    Akihiro Kitashoji, Taiki Yoshikawa, Akimasa Fujihara, Takaaki Kamamori, Shigeki Nashima, Tomoyuki Yatsuhashi

    ChemPhysChem   18 ( 15 )   2007 - 2011   2017年08月( ISSN:1439-4235

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    担当区分:最終著者, 責任著者   掲載種別:研究論文(学術雑誌)  

    © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim The inclusion of an ion gate in a tandem mass spectrometer allows a specific precursor ion to be selected, and the fragment ions are then used for structure analysis and to investigate chemical reactions. However, the performance of an ion gate has been judged simply by whether or not the target ion was selected. In this study, we designed, manufactured, constructed, and characterized a Bradbury–Nielsen ion gate (BNG). The actual ion selection ability, i.e. the gate function, of the BNG was measured for isotopes of Xez+ (z=1–6). The gate function of the BNG was 36.5±0.5 ns in width and 3–13 ns in rise and fall times. The BNG provides a simple way to select multiply charged molecular cations of small organic molecules as well as large molecules such as proteins and peptides.

    DOI: 10.1002/cphc.201700381

    PubMed

  • Inside Back Cover: Selection of a Single Isotope of Multiply Charged Xenon ( A Xe z + , A =128-136, z= 1-6) by Using a Bradbury-Nielsen Ion Gate (ChemPhysChem 15/2017) 査読

    Akihiro Kitashoji, Taiki Yoshikawa, Akimasa Fujihara, Takaaki Kamamori, Shigeki Nashima, Tomoyuki Yatsuhashi

    Wiley-Blackwell ChemPhysChem   2017年08月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/cphc.201700802

    その他URL: http://orcid.org/0000-0002-6810-7774

  • Precipitation of dichloromethane as low-chlorine carbon nanoparticles from water by femtosecond laser pulses 査読

    Okamoto Takuya, Miyasaka Erina, Mitamura Koji, Matsukawa Kimihiro, Yatsuhashi Tomoyuki

    JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY   344   178 - 183   2017年07月( ISSN:1010-6030

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.jphotochem.2017.05.011

  • Precipitation of dichloromethane as low-chlorine carbon nanoparticles from water by femtosecond laser pulses 査読

    Takuya Okamoto, Erina Miyasaka, Koji Mitamura, Kimihiro Matsukawa, Tomoyuki Yatsuhashi

    Journal of Photochemistry and Photobiology A: Chemistry   344   178 - 183   2017年07月( ISSN:1010-6030

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    担当区分:最終著者, 責任著者   掲載種別:研究論文(学術雑誌)  

    © 2017 Elsevier B.V. We report on the transformation of dichloromethane to low-chlorine carbon nanoparticles by the exposure of aqueous dichloromethane solution and/or dichloromethane/water biphasic solution to femtosecond laser pulses. The pH of either solution immediately decreased due to the reduction of dichloromethane by hydrated electrons. The time evolution of transmittance revealed that particle formation was suppressed when the initial pH was low because protons scavenge hydrated electrons. The size and morphology of nanoparticles was independent of the initial pH and the reaction solution used. The analysis of the elemental composition of carbon particles showed that the Cl/C atomic ratio was, independent on the initial pH values, greatly reduced to 0.06. We propose that the violent destruction of dichloromethane and elimination of chlorine atoms not only as Cl− but also Cl2 excludes chlorine atoms from the carbon network construction processes toward the formation of carbon nanoparticles.

    DOI: 10.1016/j.jphotochem.2017.05.011

  • Synthesis of Fluorine-Doped Hydrophilic Carbon Nanoparticles from Hexafluorobenzene by Femtosecond Laser Pulses 査読

    Okamoto Takuya, Mitamura Koji, Hamaguchi Tomoyuki, Matsukawa Kimihiro, Yatsuhashi Tomoyuki

    Wiley-Blackwell CHEMPHYSCHEM   18 ( 9 )   1007 - 1011   2017年05月( ISSN:1439-4235

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/cphc.201600602

    その他URL: http://orcid.org/0000-0002-6810-7774

  • Synthesis of Fluorine-Doped Hydrophilic Carbon Nanoparticles from Hexafluorobenzene by Femtosecond Laser Pulses 査読

    Takuya Okamoto, Koji Mitamura, Tomoyuki Hamaguchi, Kimihiro Matsukawa, Tomoyuki Yatsuhashi

    ChemPhysChem   18 ( 9 )   1007 - 1011   2017年05月( ISSN:1439-4235

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    担当区分:最終著者, 責任著者   掲載種別:研究論文(学術雑誌)  

    © 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim We report on the preparation and characterization of fluorine-doped hydrophilic carbon nanoparticles by the exposure of hexafluorobenzene or a water/hexafluorobenzene bilayer solution to femtosecond laser pulses. Uniform atom distributions are achieved not only on the particle surface but also inside the particles. The semi-ionic character of C−F bonds and the non-aggregating feature of the nanoparticles play key roles in the water-dispersible character of fluorine-doped carbon nanoparticles. We suggest the following building-up process of carbon nanoparticles: the fragmentation of hexafluorobenzene initiated by the electrons generated in laser-induced plasma followed by the reconstruction of a carbon framework of nanoparticles.

    DOI: 10.1002/cphc.201600602

    PubMed

  • フェムト秒レーザーによる液相化学反応およびナノ材料創成

    岡本拓也、中島信昭、八ッ橋知幸

    レーザー研究(レーザー学会会誌)   45 ( 5 )   278 - 282   2017年

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    共著区分:単著  

  • フェムト秒レーザーによる液相化学反応およびナノ材料創成

    岡本 拓也, 中島 信昭, 八ッ橋 知幸

    一般社団法人 レーザー学会 レーザー研究   45 ( 5 )   2017年( ISSN:0387-0200

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    We briefly review femtosecond laser induced chemical reactions and nanomaterial productions in aliquid phase. Focused intense femtosecond laser pulses create a high density of reactive species such assolvated electrons and cation radicals of the solvent. The solvated electrons efficiently reduce the metalions followed by their nanoparticle formations. Multimetallic nanoparticles, which are expected to beutilized as electromagnetic materials and catalysts, are produced. In the cases of neat organic solvents,polyynes and carbon nanoparticles are formed. We also presented the production of heteroatom-dopedcarbon nanoparticles, which are candidates of oxygen reduction catalysts in fuel cells. By using aqueousorganic solutions and/or water/organic bilayer solutions, hydrophilic carbon nanoparticles are formed bythe successive oxidation of organic molecules by hydroxyl radicals. Nanoparticle synthesis by reactivespecies in the liquid phase might be an alternative means of widely used laser ablation in liquid.

    DOI: 10.2184/lsj.45.5_278

    CiNii Article

  • フェムト秒レーザーによる液相化学反応およびナノ材料創成

    岡本 拓也, 中島 信昭, 八ッ橋 知幸

    レーザー研究   45 ( 5 )   278   2017年( ISSN:03870200

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  • Intact Four-atom Organic Tetracation Stabilized by Charge Localization in the Gas Phase 査読

    Yatsuhashi Tomoyuki, Toyota Kazuo, Mitsubayashi Naoya, Kozaki Masatoshi, Okada Keiji, Nakashima Nobuaki

    Wiley-Blackwell CHEMPHYSCHEM   17 ( 19 )   2977 - 2981   2016年10月( ISSN:1439-4235

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/cphc.201600555

    その他URL: http://orcid.org/0000-0002-6810-7774

  • Intact Four-atom Organic Tetracation Stabilized by Charge Localization in the Gas Phase 査読

    Tomoyuki Yatsuhashi, Kazuo Toyota, Naoya Mitsubayashi, Masatoshi Kozaki, Keiji Okada, Nobuaki Nakashima

    ChemPhysChem   17 ( 19 )   2977 - 2981   2016年10月( ISSN:1439-4235

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    担当区分:筆頭著者, 責任著者   掲載種別:研究論文(学術雑誌)  

    © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Several features distinguish intact multiply charged molecular cations (MMCs) from other species such as monocations and polycations: high potential energy, high electron affinity, a high density of electronic states with various spin multiplicities, and charge-dependent reactions. However, repulsive Coulombic interactions make MMCs quite unstable, and hence small organic MMCs are currently not readily available. Herein, we report that the isolated four-atom molecule diiodoacetylene survives after the removal of four electrons via tunneling. We show that the tetracation remains metastable towards dissociation because of the localization (91–95 %) of the positive charges on the terminal iodine atoms, ensuring minimum Coulomb repulsion between adjacent atoms as well as maximum charge-induced attractive dipole interactions between iodine and carbon. Our approach making use of iodines as the positively charged sites enables small organic MMCs to remain intact.

    DOI: 10.1002/cphc.201600555

  • Graphitization of Chlorohydrocarbons in Laser-Induced Plasma Filaments 査読

    Erina Miyasaka, Tomoyuki Hamaguchi, Tomoyuki Yatsuhashi

    Electronics and Communications in Japan   99 ( 10 )   51 - 57   2016年10月( ISSN:1942-9533

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    掲載種別:研究論文(学術雑誌)  

    © 2016 Wiley Periodicals, Inc. The decomposition of aqueous chlorohydrocarbons regarded as environmental pollutants has been widely studied. However, it is usually difficult to separate liquid and/or volatile products originated from chlorohydrocarbons from reactant solution. We succeeded to precipitate hydrophobic carbon nanoparticles and their agglomerates from aqueous dichloromethane by femtosecond laser (0.8 μm, 40 fs) irradiation. In the case of water/dichloromethane bilayer solution, the precipitates were produced in abundance when the water layer was exposed to femtosecond laser pulses. The time evolution of pH and transmittance revealed that the precipitation of carbon particles was preceded by dechlorination. Focusing intense femtosecond laser pulses onto water creates a high density of reactive species in a well-confined volume; that is, plasma filament. The graphitization hence solidification by using laser pulses could be a useful way to remove chlorinated compounds from their aqueous solution.

    DOI: 10.1002/ecj.11873

  • Graphitization of Chlorohydrocarbons in Laser-Induced Plasma Filaments 査読

    Miyasaka Erina, Hamaguchi Tomoyuki, Yatsuhashi Tomoyuki

    ELECTRONICS AND COMMUNICATIONS IN JAPAN   99 ( 10 )   51 - 57   2016年10月( ISSN:1942-9533

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/ecj.11873

  • Anisotropic Coulomb Explosion of CO Ligands in Group 6 Metal Hexacarbonyls: Cr(CO)(6), Mo(CO)(6), W(CO)(6) 査読

    Tanaka Hiroki, Nakashima Nobuaki, Yatsuhashi Tomoyuki

    JOURNAL OF PHYSICAL CHEMISTRY A   120 ( 35 )   6917 - 6928   2016年09月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/acs.jpca.6b05113

  • Anisotropic Coulomb Explosion of CO Ligands in Group 6 Metal Hexacarbonyls: Cr(CO)<inf>6</inf>, Mo(CO)<inf>6</inf>, W(CO)<inf>6</inf> 査読

    Hiroki Tanaka, Nobuaki Nakashima, Tomoyuki Yatsuhashi

    Journal of Physical Chemistry A   120 ( 35 )   6917 - 6928   2016年09月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    © 2016 American Chemical Society. Multiple ionization and subsequent Coulomb explosion have been studied for many organic molecules and their clusters; however, the metal complexes, particularly the large Coulombic interactions expected between a metal and its ligands, have not yet been explored. In this study, the angular distribution of CO+, oxygen, and carbon ions ejected from metal hexacarbonyls (M(CO)6, M: Cr, Mo, W) having Oh symmetry by Coulomb explosion in femtosecond laser fields (>1 × 1014 W cm-2) is investigated. The emissions of oxygen ions are well-explained in terms of the geometric alignment along a line inclined 45° relative to the CO-M-CO axis in a M(CO)4 plane. Unlike the explosion behavior of the oxygen ions located on the outer part of the molecule, the explosion behavior of the carbon ions was affected by the laser intensity, kinetic energy, and metal. This finding that the emission trends of carbon sandwiched between oxygen and metal atoms were the opposite of those for oxygen was explained by the obstruction by oxygen, the deformation of structure in bending coordinates, and the strong interaction with charged metal. The anisotropic Coulomb explosion of metal complexes reflecting their structural symmetry and central metal charge is a promising candidate for use in the investigation of large Coulombic interactions at the molecular level.

    DOI: 10.1021/acs.jpca.6b05113

  • Anisotropic Coulomb explosion of acetylene and diacetylene derivatives 査読

    Mitsubayashi Naoya, Yatsuhashi Tomoyuki, Tanaka Hiroki, Furukawa Satoshi, Kozaki Masatoshi, Okada Keiji, Nakashima Nobuaki

    INTERNATIONAL JOURNAL OF MASS SPECTROMETRY   403   43 - 52   2016年06月( ISSN:1387-3806

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.ijms.2016.03.011

  • Anisotropic Coulomb explosion of acetylene and diacetylene derivatives 査読

    Naoya Mitsubayashi, Tomoyuki Yatsuhashi, Hiroki Tanaka, Satoshi Furukawa, Masatoshi Kozaki, Keiji Okada, Nobuaki Nakashima

    International Journal of Mass Spectrometry   403   43 - 52   2016年06月( ISSN:1387-3806

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    掲載種別:研究論文(学術雑誌)  

    © 2016 Elsevier B.V. We investigated the significant differences in the angular distribution of carbon ions ejected from dimethylacetylenes (CH3-CC-CH3 and CH3-CC-CC-CH3) and diiodoacetylenes (I-CC-I and I-CC-CC-I) induced by a Coulomb explosion. The longest linear chain molecule ever reported was exposed to intense femtosecond laser fields (40 fs, <5 × 1014 Wcm-2) in this study. In the cases of the diiodoacetylenes, the angular distributions of the carbon ions were orthogonal with respect to the laser polarization direction and became narrower as the length of the molecules became longer. This is in sharp contrast to the dimethylacetylenes, in which the angular distributions of the carbon ions were parallel with respect to the laser polarization direction and became broader as the length of the molecules became longer. The specific angular distributions of carbon ions ejected from the diiodoacetylenes are explained in terms of the frozen molecular rotation, the blocking of carbon ion emission, and the bending of carbon chains at highly charged states due to the presence of iodines.

    DOI: 10.1016/j.ijms.2016.03.011

  • Metal ion reductions by femtosecond laser pulses with micro-Joule energy and their efficiencies 査読

    Nakashima Nobuaki, Yamanaka Ken-ichi, Saeki Morihisa, Ohba Hironori, Taniguchi Seiji, Yatsuhashi Tomoyuki

    Elsevier {BV} JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY   319   70 - 77   2016年03月( ISSN:1010-6030

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.jphotochem.2015.12.021

    その他URL: http://orcid.org/0000-0002-6810-7774

  • Metal ion reductions by femtosecond laser pulses with micro-Joule energy and their efficiencies 査読

    Nobuaki Nakashima, Ken Ichi Yamanaka, Morihisa Saeki, Hironori Ohba, Seiji Taniguchi, Tomoyuki Yatsuhashi

    Journal of Photochemistry and Photobiology A: Chemistry   319-320   70 - 77   2016年03月( ISSN:1010-6030

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    掲載種別:研究論文(学術雑誌)  

    © 2016 Elsevier B.V. All rights reserved. Chemical reactions of metal ions in solution were studied using 800 nm, 90 femtosecond laser pulses with a laser intensity range beginning at sub-micro-Joules/pulse, where the intensities were at or just below supercontinuum generation. Products were observed as surface resonance absorptions assignable to Ag, Au nanoparticles (NPs) and light scattering, indicating the formation of Pd NPs. The consumption efficiencies of metal ions from the Au and Pd ions were estimated to be 10-3 per incident photon. The major absorbing species of the laser energy was water, which led to the formation of solvated electrons that acted as a reducing agent of metal ions, while direct multi-photon dissociation to neutral atoms was unlikely. Metal ion Fe3+and Yb3+ systems are also discussed, where Fe3+ to Fe2+ was ascribed to two-photon absorption and Yb3+ to Yb2+ to a reduction followed by solvent ionization.

    DOI: 10.1016/j.jphotochem.2015.12.021

  • 2015年光化学討論会報告

    八ッ橋知幸

    光化学(光化学協会会誌)   46 ( 3 )   179 - 183   2015年12月

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    共著区分:単著  

  • Synthesis of hydrophilic and hydrophobic carbon nanoparticles from benzene/water bilayer solution with femtosecond laser generated plasma filaments in water 査読

    Hamaguchi T, Okamoto T, Mitamura K, Matsukawa K, Yatsuhashi T.

    Bulletin of the Chemical Society of Japan   88 ( 2 )   251 - 261   2015年

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1246/bcsj.20140247

    その他URL: http://orcid.org/0000-0002-6810-7774

  • レーザープラズマフィラメントによる有機塩素化合物の炭素粒子化 査読

    宮坂 枝里奈, 濵口 智行, 八ッ橋 知幸

    The Institute of Electrical Engineers of Japan 電気学会論文誌. C   135 ( 9 )   1075 - 1079   2015年( ISSN:0385-4221

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    掲載種別:研究論文(学術雑誌)  

    The decomposition of aqueous chlorohydrocarbons regarded as environmental pollutants has been widely studied. However, it is usually difficult to separate liquid and/or volatile products originated from chlorohydrocarbons from reactant solution. We succeeded to precipitate hydrophobic carbon nanoparticles and their agglomerates from aqueous dichloromethane by femtosecond laser (0.8 µm, 40 fs) irradiation. In the case of water/dichloromethane bilayer solution, the precipitates were produced in abundance when the water layer was exposed to femtosecond laser pulses. The time evolution of pH and transmittance revealed that the precipitation of carbon particles was preceded by dechlorination. Focusing intense femtosecond laser pulses onto water creates a high density of reactive species in a well-confined volume; i.e., plasma filament. The graphitization hence solidification by using laser pulses could be an useful way to remove chlorinated compounds from their aqueous solution.

    DOI: 10.1541/ieejeiss.135.1075

    CiNii Article

    その他URL: http://orcid.org/0000-0002-6810-7774

  • レーザープラズマフィラメントによる有機塩素化合物の炭素粒子化 査読

    宮坂 枝里奈, 濵口 智行, 八ッ橋 知幸

    電気学会論文誌C(電子・情報・システム部門誌)   135 ( 9 )   1075 - 1079   2015年( ISSN:0385-4221

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1541/ieejeiss.135.1075

    CiNii Article

  • Synthesis of hydrophilic and hydrophobic carbon nanoparticles from benzene/water bilayer solution with femtosecond laser generated plasma filaments in water 査読

    Tomoyuki Hamaguchi, Takuya Okamoto, Koji Mitamura, Kimihiro Matsukawa, Tomoyuki Yatsuhashi

    Bulletin of the Chemical Society of Japan   88 ( 2 )   251 - 261   2015年( ISSN:0009-2673

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    掲載種別:研究論文(学術雑誌)  

    © 2014 The Chemical Society of Japan. We synthesized hydrophilic and hydrophobic carbon nanoparticles (CNPs) by femtosecond laser (0.8 μm, 40 fs) irradiation of the water layer of an aerated benzene/water (B/W) bilayer solution. Focusing intense femtosecond laser pulses onto water creates a high density of reactive species such as hydroxyl radicals in a well-confined volume; i.e., plasma filament. The properties of the particle surface were controlled simply by adjusting the laser focusing position, the duration between the preparation of B/W bilayer solution and the laser irradiation. The hydrophobic CNPs appeared to be nearly identical in size and morphology to hydrophilic CNPs. Raman spectroscopy revealed that both particles had a graphitic and disordered structure; however, IR spectroscopy clearly showed that the hydroxy group is the origin of the hydrophilicity. The time evolution of particle formation, products in water, and benzene dissolution behavior in water reveals that the surface properties are determined by the concentration of benzene in water. The diluted aqueous benzene solution gave hydrophilic particles; however, the density of particles was much smaller than that formed in B/W bilayer solution. We concluded that the production of denser hydrophilic CNPs in B/W bilayer was achieved by limiting the concentration of benzene in water layer by B/W interface, and by continuously supplying benzene into water layer through B/W interface. We discuss the subsequent reaction mechanism leading to CNPs of different surface characters.

    DOI: 10.1246/bcsj.20140247

    CiNii Article

  • Ionic Valence Change of Metal Ions in Solution by Femtosecond Laser Excitation Accompanied by White-Light Laser 査読

    Nakashima Nobuaki, Yamanaka Ken-ichi, Itoh Ayaka, Yatsuhashi Tomoyuki

    CHINESE JOURNAL OF PHYSICS   52 ( 1 )   504 - 518   2014年02月( ISSN:0577-9073

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.6122/CJP.52.504

  • Ionic valence change of metal ions in solution by femtosecond laser excitation accompanied by white-light laser 査読

    Nakashima N, Yamanaka K.-I, Itoh A, Yatsuhashi T.

    Chinese Journal of Physics   52 ( 1 )   504 - 518   2014年

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    掲載種別:研究論文(学術雑誌)  

    その他URL: http://orcid.org/0000-0002-6810-7774

  • レーザーイオン化の基礎と応用

    八ッ橋知幸

    光学(日本光学会会誌)   42 ( 11 )   530 - 538   2013年11月

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    共著区分:単著  

  • Reduction of Yb(III) to Yb(II) by Two-Color Two-Photon Excitation 査読

    Nakashima Nobuaki, Yamanaka Ken-ichi, Yatsuhashi Tomoyuki

    JOURNAL OF PHYSICAL CHEMISTRY A   117 ( 35 )   8352 - 8359   2013年09月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jp402194g

    その他URL: http://orcid.org/0000-0002-6810-7774

  • Reduction of Yb(III) to Yb(II) by two-color two-photon excitation 査読

    Nobuaki Nakashima, Ken Ichi Yamanaka, Tomoyuki Yatsuhashi

    Journal of Physical Chemistry A   117 ( 35 )   8352 - 8359   2013年09月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    Ytterbium 3+ ions in alcohol were found to be reduced to the corresponding 2+ ions upon laser irradiation with a stepwise two-color two-photon excitation. The infrared (975-nm) pulse with a duration of 4 ns pumps the ground state to the 4f excited state with the transition of 2F5/2 ← 2F7/2, and the second photon (355-nm) generates the charge transfer (CT) state of Cl 3p to Yb 4f; the reduction then occurs. Laser energy and excitation wavelength dependencies well-explain the above mechanism. The product Yb2+ was detected by its absorption spectrum peak at 367 nm. The absorption spectrum of the intermediate in the two-photon chemistry was measured from the 4f excited state (2F5/2) to the CT state by nanosecond laser photolysis. The intermediate spectrum appears in the wavelengths shorter than 400 nm with the molar extinction coefficient on the order of (102 M-1 cm-1) at 340 nm and can be explained in terms of the CT absorption shifted by IR photon energy. A UV nanosecond laser pulse (266 nm from a YAG laser with a duration of 6 ns) can generate the reactive CT state by one-photon absorption and leads to Yb 2+ formation. The reaction yields for single-photon UV excitation and the second photon in the two-photon excitation are on the order of 0.1, suggesting that the reactive states are a common CT state. © 2013 American Chemical Society.

    DOI: 10.1021/jp402194g

  • Coulomb Explosion of Dichloroethene Geometric Isomers at 1 PW cm(-2) 査読

    Yatsuhashi Tomoyuki, Nakashima Nobuaki, Azuma Juri

    JOURNAL OF PHYSICAL CHEMISTRY A   117 ( 7 )   1393 - 1399   2013年02月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jp310361x

    その他URL: http://orcid.org/0000-0002-6810-7774

  • Coulomb explosion of dichloroethene geometric isomers at 1 PW cm <sup>-2</sup> 査読

    Tomoyuki Yatsuhashi, Nobuaki Nakashima, Juri Azuma

    Journal of Physical Chemistry A   117 ( 7 )   1393 - 1399   2013年02月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    Strikingly different Coulomb explosion behavior under intense laser fields is shown between the cis and trans geometric isomers of dichloroethene using 40-fs pulses at 0.8 μm. Although the fragment-ion distributions in the mass spectra did not aid in the identification of the geometric and positional isomers of the dichloroethenes, we found that the angular distributions of atomic ions were strongly dependent on the geometric structures. The angular distributions of chlorine ions, carbon ions, and protons were similar between 1,1- and cis-1,2-dichloroethene, whereas trans-1,2-dichloroethene showed a very sharp distribution of chlorine ions and quite different distributions of carbon ions and protons. The origin of the anisotropic ion angular distributions is the geometric selection of molecules in the tunnel-ionization process followed by a Coulomb explosion, although molecules are randomly oriented in the gas phase. The highly charged molecular ions exploded into pieces, and the direction of atomic-ion ejection was strongly correlated with the relative configuration of atoms with respect to the electron-extraction axis, the repulsion with adjacent atomic ions within the molecule, and the degree of the persistence of a molecular frame. We propose herein that the most probable electron-extraction axis by tunneling, which is governed by the configuration of molecular orbitals, is different among three dichloroethene isomers. Because multiple ionization under intense laser fields occurs by sequential tunneling processes, the first ionization step at the leading edge of the laser pulse dominates the further ionization steps. Therefore, the shapes of the highest occupied molecular orbitals and probably the underlying orbitals determine the anisotropic emission of atomic ions that can be used to identify isomers. © 2013 American Chemical Society.

    DOI: 10.1021/jp310361x

  • レーザーイオン化の基礎と応用 査読

    八ツ橋 知幸

    光学   42   530 - 538   2013年

  • 分子のアト秒観測に向けて

    八ッ橋知幸

    パリティ   27 ( 12 )   30 - 33   2012年11月

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    共著区分:単著  

  • Novel Method of Producing Carbon Nanoparticles on Benzene/Water Interface with Femtosecond Laser Plasma Filament 査読

    YATSUHASHI Tomoyuki, UCHIDA Naoko, NISHIKAWA Kayo

    Chemistry letters   41 ( 7 )   722 - 724   2012年07月( ISSN:03667022

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    掲載種別:研究論文(学術雑誌)  

    CiNii Article

  • Novel Method of Producing Carbon Nanoparticles on Benzene/Water Interface with Femtosecond Laser Plasma Filament 査読

    Yatsuhashi Tomoyuki, Uchida Naoko, Nishikawa Kayo

    The Chemical Society of Japan CHEMISTRY LETTERS   41 ( 7 )   722 - 724   2012年07月( ISSN:0366-7022

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    掲載種別:研究論文(学術雑誌)  

    The irradiation of NIR femtosecond laser pulses to a benzene/water bilayer dramatically enhanced the formation of carbon nanoparticles compared with that in neat benzene. The focusing-position-dependent chemistry and the oxidative mechanism of nanoparticle formation are discussed.

    DOI: 10.1246/cl.2012.722

    CiNii Article

    その他URL: http://orcid.org/0000-0002-6810-7774

  • Novel Method of Producing Carbon Nanoparticles on Benzene/Water Interface with Femtosecond Laser Plasma Filament

    YATSUHASHI Tomoyuki, UCHIDA Naoko, NISHIKAWA Kayo

    41 ( 7 )   722 - 724   2012年07月( ISSN:03667022

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  • Novel method of producing carbon nanoparticles on benzene/water interface with femtosecond laser plasma filament 査読

    Tomoyuki Yatsuhashi, Naoko Uchida, Kayo Nishikawa

    Chemistry Letters   41 ( 7 )   722 - 724   2012年( ISSN:0366-7022

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    掲載種別:研究論文(学術雑誌)  

    The irradiation of NIR femtosecond laser pulses to a benzene/water bilayer dramatically enhanced the formation of carbon nanoparticles compared with that in neat benzene. The focusing-position-dependent chemistry and the oxidative mechanism of nanoparticle formation are discussed. © 2012 The Chemical Society of Japan.

    DOI: 10.1246/cl.2012.722

    CiNii Article

  • Formation of p-xylylene from p-xylene by a two-photon process and hexamethyl Dewar benzene from hexamethylbenzene by a one-photon process at 193 nm 査読

    Mitsubayashi Naoya, Yatsuhashi Tomoyuki, Nakashima Nobuaki

    JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY   219 ( 2-3 )   273 - 277   2011年04月( ISSN:1010-6030

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.jphotochem.2011.02.031

  • Formation of p-xylylene from p-xylene by a two-photon process and hexamethyl Dewar benzene from hexamethylbenzene by a one-photon process at 193 nm 査読

    Naoya Mitsubayashi, Tomoyuki Yatsuhashi, Nobuaki Nakashima

    Journal of Photochemistry and Photobiology A: Chemistry   219 ( 2-3 )   273 - 277   2011年04月( ISSN:1010-6030

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    掲載種別:研究論文(学術雑誌)  

    While studying a series of methyl-substituted benzenes, C6H 6-n(CH3)n with n = 2, 3, 4, 6, and perfluorobenzene in the gas phase using 193-nm laser flash photolysis, we observed the formation of p-xylylene (benzoquinodimethane) due to the elimination of two hydrogen atoms as a result of a two-photon process. The results were explained in terms of an intermediate hot molecule formed by internal conversion which finally led to the ground electronic state. Quadratical dependencies on the photoproducts were observed for toluene, xylene, mesitylene, and perfluorobenzene in the presence of a foreign gas, while linear dependencies were observed for durene and hexamethylbenzene. Dewar-type benzene was detected from photolysis of hexamethylbenzene. © 2011 Elsevier B.V.

    DOI: 10.1016/j.jphotochem.2011.02.031

  • Fe<sup>z+</sup> (z = 1-6) generation from ferrocene 査読

    Tomoyuki Yatsuhashi, Eri Murakami, Nobuaki Nakashima

    Physical Chemistry Chemical Physics   13 ( 10 )   4234 - 4238   2011年03月( ISSN:1463-9076

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    掲載種別:研究論文(学術雑誌)  

    Multiply charged iron atoms up to Fe6+ with few carbon ions were produced from ferrocene under intense femtosecond laser fields. The production of Fe4+ and Fe5+ from ferrocene requires much less laser intensity than theoretically expected for iron atoms. The dissociation of ferrocene and the generation mechanism of multiply charged iron atoms are discussed. © 2011 the Societies Owner.

    DOI: 10.1039/c0cp02122a

  • Persistence of Iodines and Deformation of Molecular Structure in Highly Charged Diiodoacetylene: Anisotropic Carbon Ion Emission 査読

    Yatsuhashi Tomoyuki, Mitsubayashi Naoya, Itsukashi Masako, Kozaki Masatoshi, Okada Keiji, Nakashima Nobuaki

    CHEMPHYSCHEM   12 ( 1 )   122 - 126   2011年01月( ISSN:1439-4235

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1002/cphc.201000756

  • Persistence of iodines and deformation of molecular structure in highly charged diiodoacetylene: Anisotropic carbon ion emission 査読

    Tomoyuki Yatsuhashi, Naoya Mitsubayashi, Masako Itsukashi, Masatoshi Kozaki, Keiji Okada, Nobuaki Nakashima

    ChemPhysChem   12 ( 1 )   122 - 126   2011年01月( ISSN:1439-4235

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    掲載種別:研究論文(学術雑誌)  

    Multiply charged carbons from diiodoacetylene are emitted orthogonally to the laser polarization direction with significant energy, whereas those from acetylene were emitted parallel to the laser polarization direction (see scheme). The distinct carbon emissions from diiodoacetylene can be explained in terms of the persistence of a molecular frame at a high charge state, and the deformation within the Coulomb field formed by the two adjacent iodine ions. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

    DOI: 10.1002/cphc.201000756

  • Formation of Xylylene from p-Xylene by a Two-photon Process and Hexamethyl Dewar Benzene from Hexamethylbenzene by a One-photon Process at 193 nm 査読

    Mitsubayashi, N.; Yatsuhashi, T.; Nakashima, N.

    J. Photochem. Photobiol. A   219 ( 42769 )   273 - 277   2011年

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    掲載種別:研究論文(学術雑誌)   共著区分:共著  

  • Fez+ (z=1-6) generation from ferrocene 査読

    Yatsuhashi Tomoyuki, Murakami Eri, Nakashima Nobuaki

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   13 ( 10 )   4234 - 4238   2011年( ISSN:1463-9076

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/c0cp02122a

    その他URL: http://orcid.org/0000-0002-6810-7774

  • Persistence of Iodines and Deformation of Molecular Structure in Highly Charged Diiodoacetylene: Anisotropic Carbon Ion Emission

    Yatsuhashi,T.;* Mitsubayashi, N.; Itsukashi, M.; Kozaki, M.; Okada, K.; Nakashima, N.

    ChemPhysChem.(Communications)   12 ( 1 )   122 - 126   2011年

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    掲載種別:研究論文(学術雑誌)  

  • Fez+ (z = 1 - 6) Generation from Ferrocene

    Mitsubayashi, N.; Yatsuhashi, T.; Nakashima, N.*

    Phys.Chem.Chem.Phys. (Communications)   13 ( 10 )   4234 - 4238   2011年

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    掲載種別:研究論文(学術雑誌)  

  • Dissociation and Multiply Charged Silicon Ejection in High Abundance from Hexamethyldisilane 査読

    Yatsuhashi Tomoyuki, Nakashima Nobuaki

    JOURNAL OF PHYSICAL CHEMISTRY A   114 ( 44 )   11890 - 11895   2010年11月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jp1067186

  • Dissociation and multiply charged silicon ejection in high abundance from hexamethyldisilane 査読

    Tomoyuki Yatsuhashi, Nobuaki Nakashima

    Journal of Physical Chemistry A   114 ( 44 )   11890 - 11895   2010年11月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    Quadruply charged, neon-like silicon and helium-like carbon were generated by the exposure of hexamethyldisilane to intense femtosecond laser pulses. Dissociation of the silicon?silicon bond, the formation of highly charged silicons, as well as the saturation intensity of their formation were studied by mass spectroscopy. The production of these ions in high abundance, but also with lower laser intensity than theoretically expected for the element, was accomplished by using organosilicon compounds. Multiply charged silicon was generated at low laser intensity because stripping electrons from organosilicon compounds is much easier than from pure silicon due to the loose binding of electrons belonging to molecular orbitals. Femtosecond laser ionization is a valuable methodology for producing highly charged ions in high abundance and is useful in many fields of interest. © 2010 American Chemical Society.

    DOI: 10.1021/jp1067186

  • Linear Response of Multiphoton Reaction: Three-Photon Cycloreversion of Anthracene Biplanemer in Solution by Intense Femtosecond Laser Pulses 査読

    Yatsuhashi Tomoyuki, Nakahagi Yuki, Okamoto Hideki, Nakashima Nobuaki

    JOURNAL OF PHYSICAL CHEMISTRY A   114 ( 39 )   10475 - 10480   2010年10月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jp1041475

  • Linear response of multiphoton reaction: Three-photon Cycloreversion of anthracene biplanemer in solution by intense femtosecond laser pulses 査読

    Tomoyuki Yatsuhashi, Yuki Nakahagi, Hideki Okamoto, Nobuaki Nakashima

    Journal of Physical Chemistry A   114 ( 39 )   10475 - 10480   2010年10月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    The photocycloreversion of anthracene photodimers and biplanemer in solution was investigated by nonresonant intense femtosecond laser pulses. Cycloreversion of biplanemer showed a pseudolinear response to laser intensity whereas the formation of anthracene from photodimer was proportional to the cubic of laser intensity. The unusual intensity dependence of biplanemer was explained in terms of the sum of three-photon intramolecular cycloreversion and the recovery of reactant by a two-photon intramolecular cyclodimerization. The coexistence of high- and low-order multiphoton processes within the same laser pulse originated in the spatial distribution of the laser intensity. We observed white light emerging from the sample solution; however, the effect of solvated electrons was not observed in the present system. The saturation of both the photoreaction and white light due to a volume effect was observed at high intensity. © 2010 American Chemical Society.

    DOI: 10.1021/jp1041475

    PubMed

  • Formation and Fragmentation of Quadruply Charged Molecular Ions by Intense Femtosecond Laser Pulses 査読

    Yatsuhashi Tomoyuki, Nakashima Nobuaki

    JOURNAL OF PHYSICAL CHEMISTRY A   114 ( 28 )   7445 - 7452   2010年07月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jp103725s

  • Formation and fragmentation of quadruply charged molecular ions by intense femtosecond laser pulses 査読

    Tomoyuki Yatsuhashi, Nobuaki Nakashima

    Journal of Physical Chemistry A   114 ( 28 )   7445 - 7452   2010年07月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    We investigated the formation and fragmentation of multiply charged molecular ions of several aromatic molecules by intense nonresonant femtosecond laser pulses of 1.4 -m with a 130 fs pulse duration (up to 2 × 10 14 W cm-2). Quadruply charged states were produced for 2,3-benzofluorene and triphenylene molecular ion in large abundance, whereas naphthalene and 1,1α-binaphthyl resulted only in up to triply charged molecular ions. The laser wavelength was nonresonant with regard to the electronic transitions of the neutral molecules, and the degree of fragmentation was strongly correlated with the absorption of the singly charged cation radical. Little fragmentation was observed for naphthalene (off-resonant with cation), whereas heavy fragmentation was observed in the case of 1,1α-binaphthyl (resonant with cation). The degree of H2 (2H) and 2H2 (4H) elimination from molecular ions increased as the charge states increased in all the molecules examined. A striking difference was found between triply and quadruply charged 2,3-benzofluorene: significant suppression of molecular ions with loss of odd number of hydrogen was observed in the quadruply charged ions. The Coulomb explosion of protons in the quadruply charged state and succeeding fragmentation resulted in the formation of triply charged molecular ions with an odd number of hydrogens. The hydrogen elimination mechanism in the highly charged state is discussed. © 2010 American Chemical Society.

    DOI: 10.1021/jp103725s

  • Reduction of Sm3+ to Sm2+ by an Intense Femtosecond Laser Pulse in Solution 査読

    Nishida Daisuke, Yamade Eriko, Kusaba Mitsuhiro, Yatsuhashi Tomoyuki, Nakashima Nobuaki

    JOURNAL OF PHYSICAL CHEMISTRY A   114 ( 18 )   5648 - 5654   2010年05月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jp9109089

  • Reduction of Sm<sup>3+</sup> to Sm<sup>2+</sup> by an intense femtosecond laser pulse in solution 査読

    Daisuke Nishida, Eriko Yamade, Mitsuhiro Kusaba, Tomoyuki Yatsuhashi, Nobuaki Nakashima

    Journal of Physical Chemistry A   114 ( 18 )   5648 - 5654   2010年05月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    Samarium 3+ ions in methanol were found to be reduced to the corresponding 2+ ions upon irradiation with intense femtosecond laser pulses. The reduction was observed at both pulses with central wavelengths of 403 nm converted from an 800 fs fundamental pulse and 800 nm with a duration of 43 fs. When the laser wavelength was tuned to the 4f-4f absorption at 403 nm corresponding to the 6P3/2 ← 6H5/2 transition, the reduction occurred by multiphoton absorption, presumably due to reaching the deep charge transfer state. In the case of excitation by 800 nm pulses of the fundamental wavelength of the Ti:sapphire laser, the reduction is considered to occur via solvent ionization followed by electron capture by Sm3+. The product Sm2+ was detected by its fluorescence, which was observed for the first time in solution and showed a broad spectrum peak around 750 nm with a quantum yield of 0.050 in methanol in the presence of 15-crown-5-ether. © 2010 American Chemical Society.

    DOI: 10.1021/jp9109089

  • Reduction of Sm3+ to Sm2+ by an Intense Femtosecond Laser Pulse in Solution

    Nishida, D.; Yamade, E; Yatsuhashi, T.; Kusaba, M.; Nakashima, N.

    J. Phys. Chem. A   114 ( 18 )   5648 - 5654   2010年

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    掲載種別:研究論文(学術雑誌)  

  • Formation and Fragmentation of Quadruply Charged Molecular Ions by Intense Femtosecond Laser Pulses

    Yatsuhashi,T.;* Nakashima, N.

    J. Phys. Chem. A   114 ( 28 )   7445 - 7452   2010年

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    掲載種別:研究論文(学術雑誌)  

  • Linear Responce of Multiphoton Reaction: Three-photon Cycloreversion of Anthracene Biplanemer in Solution by Intense Femtosecond Laser Pulses

    Yatsuhashi,T.*; Nakahagi,Y.; Okamoto, H.; Nakashima, N.

    J. Phys. Chem. A   114 ( 39 )   10475 - 10480   2010年

     詳細を見る

    掲載種別:研究論文(学術雑誌)  

  • Dissociation and Multiply Charged Silicon Ejection in High Abundance from Hexamethyldisilane

    Yatsuhashi,T.*; Nakashima, N.

    J. Phys. Chem. A   114 ( 44 )   11890 - 11895   2010年

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    掲載種別:研究論文(学術雑誌)  

  • Ionization and Fragmentation of Alkylphenols by 0.8-1.5 mu m Femtosecond Laser Pulses 査読

    Tanaka Michinori, Kawaji Mariko, Yatsuhashi Tomoyuki, Nakashima Nobuaki

    JOURNAL OF PHYSICAL CHEMISTRY A   113 ( 44 )   12056 - 12062   2009年11月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jp902557v

  • Ionization and fragmentation of alkylphenols by 0.8-1.5 pm femtosecond laser pulses 査読

    Michinori Tanaka, Mariko Kawaji, Tomoyuki Yatsuhashi, Nobuaki Nakashima

    Journal of Physical Chemistry A   113 ( 44 )   12056 - 12062   2009年11月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    Ionization and fragmentation were studied on alkylphenols with long alkyl chains (p-(C6H4)(OH)(CnH2n-1), n = 1,3,5,8,9) and, for reference, on alkylbenzenes ((C6H 5)(CnH2n-1), n = 1,3,5,7,9) by intense femtosecond laser pulses, typically with 43 fs duration at 0.8 μm and 140 fs at 1.3 μm in an intensity range of 1014 W cm-2. The major products were the corresponding molecular and C7 fragment ions from the alkylphenols and alkylbenzenes. The molecular ion yields decreased from nearly 1 (n = 1) to 0.3-0.5 (n = 9) when the carbon number in the alkyl chain increased for both excitation wavelengths. Higher yields of the molecular ions were observed at a longer wavelength of 1.3 μm. The long wavelengths in the range of 1.3-1.5 μm were used to determine whether or not -OH absorption had any increase in fragment ions. No effect was observed by vibrational overtone excitation of the -OH group in this wavelength range. Direct dissociation by cation absorption is the most plausible explanation of the present fragmentation results. Other possible mechanisms were discussed, including a statistical model, an effect of electron rescattering, a multiactive electron model, and dissociation from the superexcited state. In the case of cyclohexane, nonresonant wavelength excitation with a pulse of 1.3 μm (150 fs) effectively suppressed fragmentation more than excitation by a resonant but short-duration pulse (0.8 μm, 15 fs). © 2009 American Chemical Society.

    DOI: 10.1021/jp902557v

  • Ionization of Anthracene Followed by Fusion in the Solid Phase under Intense Nonresonant Femtosecond Laser Fields 査読

    Yatsuhashi Tomoyuki, Nakashima Nobuaki

    JOURNAL OF PHYSICAL CHEMISTRY C   113 ( 27 )   11458 - 11463   2009年07月( ISSN:1932-7447

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jp8082985

  • Ionization of anthracene followed by fusion in the solid phase under intense nonresonant femtosecond laser fields 査読

    Tomoyuki Yatsuhashi, Nobuaki Nakashima

    Journal of Physical Chemistry C   113 ( 27 )   11458 - 11463   2009年07月( ISSN:1932-7447

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    掲載種別:研究論文(学術雑誌)  

    Fused anthracene cation and a series of anthracene-CnH m cluster-like products were observed on irradiation with nonresonant femtosecond pulses at 1.4 m. Ionization of polycrystalline anthracene revealed strikingly different features such as the absence of multiply charged molecular ions, the appearance of H+ and C+ at low intensity without the formation of CnHm fragment ions, CnH m-attached and detached molecular ions, and multimer cation formation, compared with the gas-phase experiments. The fusion reactions of anthracene and CnHm fragments indicated the presence of novel reactions among high-density cations in the crystal produced by femtosecond laser irradiation. © 2009 American Chemical Society.

    DOI: 10.1021/jp8082985

  • 高強度フェムト秒レーザーで拓く化学反応

    八ッ橋知幸

    化学と工業(日本化学会会誌 飛翔する若手研究者欄)   62 ( 6 )   637 - 639   2009年06月

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    共著区分:単著  

  • PHYS 347-Lanthanide ion reduction by an intense femtosecond laser pulse 査読

    Nakashima Nobuaki, Nishida Daisuke, Kusaba Mitsuhiro, Yatsuhashi Tomoyuki

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   237   2009年03月( ISSN:0065-7727

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    掲載種別:研究論文(学術雑誌)  

  • PHYS 347-Lanthanide ion reduction by an intense femtosecond laser pulse 査読

    Nobuaki Nakashima, Daisuke Nishida, Mitsuhiro Kusaba, Tomoyuki Yatsuhashi

    ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY   237   2009年03月( ISSN:0065-7727

  • Ionization and fragmentation of organic molecules by 0.8-1.5 μm femtosecond laser pulses

    Nakashima N, Tanaka M, Kawaji M, Yatsuhashi T.

    Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest   2009年

  • Ionization and fragmentation of organic molecules by 0.8-1.5 μm femtosecond laser pulses

    Nakashima N, Tanaka M, Kawaji M, Yatsuhashi T.

    Optics InfoBase Conference Papers   2009年

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  • Ionization of Anthracene Followed by Fusion in the Solid Phase underIntense Nonresonant Femtosecond Laser Fields

    Yatsuhashi, T.; Nakashima, N.

    J. Phys. Chem. C   113 ( 27 )   11458 - 11463   2009年

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    掲載種別:研究論文(学術雑誌)  

  • Ionization and Fragmentation of Alkylphenols by 0.8-1.5 μm Femtosecond Laser Pulses

    Nakashima, N.; Tanaka, M.; Kawaji, M.; Yatsuhashi, T.

    J. Phys. Chem. A   113 ( 44 )   12056 - 12062   2009年

     詳細を見る

    掲載種別:研究論文(学術雑誌)  

  • Ionization and fragmentation of organic molecules by 0.8-1.5 μm femtosecond laser pulses 査読

    Nakashima N, Tanaka M, Kawaji M, Yatsuhashi T

    Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest   1164 - 1165   2009年

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    掲載種別:研究論文(国際会議プロシーディングス)  

    DOI: 10.1109/CLEOPR.2009.5292380

    その他URL: http://orcid.org/0000-0002-6810-7774

  • High-Order Multiphoton Fluorescence of Organic Molecules in Solution by Intense Femtosecond Laser Pulses 査読

    Yatsuhashi Tomoyuki, Ichikawa Soh, Shigematsu Yukari, Nakashima Nobuaki

    JOURNAL OF THE AMERICAN CHEMICAL SOCIETY   130 ( 46 )   15264 - +   2008年11月( ISSN:0002-7863

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/ja806488n

  • High-order multiphoton fluorescence of organic molecules in solution by intense femtosecond laser pulses 査読

    Tomoyuki Yatsuhashi, Soh Ichikawa, Yukari Shigematsu, Nobuaki Nakashima

    Journal of the American Chemical Society   130 ( 46 )   15264 - 15265   2008年11月( ISSN:0002-7863

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    掲載種別:研究論文(学術雑誌)  

    The five and possibly seven-photon fluorescence was observed for organic molecules in solution for the first time. A high-intensity laser enabled us to measure the properties of the high and any-order processes, and the emission could be directly visualized by the eye. These results showed that the common two-photon microscope could be upgraded to the higher order multiphoton microscope by choosing suitable excitation wavelengths. The multiphoton absorption cross sections differed by a factor of 1033 as the order of the multiphoton process increased. Copyright © 2008 American Chemical Society.

    DOI: 10.1021/ja806488n

  • Reduction of Eu(3+) to Eu(2+) by an intense femtosecond laser pulse in solution 査読

    Nishida Daisuke, Kusaba Mitsuhiro, Yatsuhashi Tomoyuki, Nakashima Nobuaki

    CHEMICAL PHYSICS LETTERS   465 ( 4-6 )   238 - 240   2008年11月( ISSN:0009-2614

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.cplett.2008.10.005

  • Reduction of Eu<sup>3+</sup> to Eu<sup>2+</sup> by an intense femtosecond laser pulse in solution 査読

    Daisuke Nishida, Mitsuhiro Kusaba, Tomoyuki Yatsuhashi, Nobuaki Nakashima

    Chemical Physics Letters   465 ( 4-6 )   238 - 240   2008年11月( ISSN:0009-2614

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    掲載種別:研究論文(学術雑誌)  

    Europium 3+ ions in methanol were found to be reduced to the corresponding 2+ ions upon irradiation with intense femtosecond laser pulses. The excitation wavelength of 800 nm was nonresonant with their electronic transitions of Eu3+. It is notable that femtosecond white-light laser was generated when the reactions occurred. The mechanisms can be explained in terms of solvated electron formation followed by the reduction. The electron ejection in a focused beam in solution has been known to be accompanied by white-light laser. © 2008 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cplett.2008.10.005

  • Explosive desorption and fragmentation of molecular ion from solid fullerene by intense nonresonant femtosecond laser pulses 査読

    Yatsuhashi Tomoyuki, Nakashima Nobuaki

    JOURNAL OF PHYSICAL CHEMISTRY A   112 ( 26 )   5781 - 5785   2008年07月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jp8023028

  • Explosive desorption and fragmentation of molecular ion from solid fullerene by intense nonresonant femtosecond laser pulses 査読

    Tomoyuki Yatsuhashi, Nobuaki Nakashima

    Journal of Physical Chemistry A   112 ( 26 )   5781 - 5785   2008年07月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    Desorption of C60+ and its dimer cation was investigated on irradiation with nonresonant femtosecond laser pulses at 1.4 μm. Ionization of solid C60 revealed strikingly different features, such as the absence of multiply charged molecular ions, the emission of C+ at low laser intensity, C2 attachments, delayed ionization, and dimer cation formation, as compared with the gas phase experiments. The large kinetic energy distribution of ions found in this study indicated that the desorption process was mainly driven by an electrostatic mechanism rather than by thermal, photochemical, or volume expansion mechanisms. Singly charged C60 emission by a Coulomb explosion due to the high density of C60+ is suggested. © 2008 American Chemical Society.

    DOI: 10.1021/jp8023028

    PubMed

  • 強光子場下における有機分子のイオン化

    八ッ橋知幸、中島信昭

    しょうとつ   5 ( 2 )   5 - 21   2008年03月

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    共著区分:単著  

  • Explosive Desorption, and Fragmentation of Molecular Ion from Solid Fullerene by Intense Nonresonant Femtosecond Laser Pulses

    Yatsuhashi, T.; Nakashima, N.

    J. Phys. Chem. A   112 ( 26 )   5781 - 5785   2008年

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    掲載種別:研究論文(学術雑誌)  

  • Reduction of Eu3+ to Eu2+ by an Intense FemtosecondLaser Pulse in Solutio

    Nishida, D.; Kusaba, M.; Yatsuhashi, T.; Nakashima, N.

    Chem. Phys. Lett.   465 ( 42831 )   238 - 240   2008年

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    掲載種別:研究論文(学術雑誌)  

  • High-Order Multiphoton Fluorescence of Organic Molecules by Intense Femtosecond Laser Pulses

    Yatsuhashi, T.; Ichikawa, S.; Shigematsu, Y.; Nakashima, N.

    J. Am. Chem. Soc.(Communications)   130 ( 46 )   15264 - 15265   2008年

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    掲載種別:研究論文(学術雑誌)  

  • 強光子場下における有機分子のイオン化

    八ッ橋 知幸, 中島 信昭

    しょうとつ 5(2)   5 - 21   2008年

  • 強光子場下における有機分子のイオン化 査読

    八ッ橋 知幸, 中島 信昭

    しょうとつ(原子衝突研究協会会誌) 5   5 - 21   2008年

  • 強光子場下における有機分子のイオン化

    八ツ橋 知幸, 中島 信昭

    原子衝突学会誌しょうとつ   5 ( 2 )   5   2008年

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  • Atomiclike ionization and fragmentation of a series of CH3-X (X : H, F, Cl, Br, I, and CN) by an intense femtosecond laser 査読

    Tanaka Michinori, Murakami Masanao, Yatsuhashi Tomoyuki, Nakashima Nobuaki

    JOURNAL OF CHEMICAL PHYSICS   127 ( 10 )   2007年09月( ISSN:0021-9606

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1063/1.2764078

  • Anisotropic bulletlike emission of terminal ethynyl fragment ions: Ionization of ethynylbenzene-d under intense femtosecond laser fields 査読

    Yatsuhashi Tomoyuki, Murakami Masanao, Nakashima Nobuaki

    JOURNAL OF CHEMICAL PHYSICS   126 ( 19 )   2007年05月( ISSN:0021-9606

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1063/1.2738468

  • Enhancement of anthracene fragmentation by circularly polarized intense femtosecond laser pulse 査読

    Murakami Masanao, Tanaka Michinori, Yatsuhashi Tomoyuki, Nakashima Nobuaki

    JOURNAL OF CHEMICAL PHYSICS   126 ( 10 )   2007年03月( ISSN:0021-9606

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1063/1.2713107

  • Intact molecular ion formation of some organic molecules by femtosecond lasers

    Nakashima N, Yatsuhashi T.

    Springer Series in Chemical Physics   85   25 - 41   2007年

  • Ultrafast relaxation and coherent oscillations in aminobenzonitriles in the gas phase probed by intense-field ionization 査読

    Fuss Werner, Schmid Wolfram E., Pushpa Kumbil Kuttan, Trushin Sergei A., Yatsuhashi Tomoyuki

    PHYSICAL CHEMISTRY CHEMICAL PHYSICS   9 ( 10 )   1151 - 1169   2007年( ISSN:1463-9076

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1039/b611877a

  • Enhancement of Anthracene Fragmentation by Circularly Polarized Intense Femtosecond Laser Pulse

    Murakami, M.; Tanaka, M.; Yatsuhashi, T.; Nakashima, N.

    J. Chem. Phys.   126 ( 10 )   104304   2007年

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    掲載種別:研究論文(学術雑誌)  

  • Atomiclike ionization and fragmentation of a series of CH3-X (X: H, F, Cl, Br, I, and CN) by an intense femtosecond laser

    Tanaka, M.; Murakami, M.; Yatsuhashi, T.; Nakashima, N.

    J. Chem. Phys.   127 ( 10 )   104314   2007年

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    掲載種別:研究論文(学術雑誌)  

  • Anisotropic bulletlike emission of terminal ethynyl fragment ions: ionization of ethynylbenzene-d under intense femtosecond laser fields

    Yatsuhashi, T.; Murakami, M.; Nakashima, N.

    J. Chem. Phys.   126 ( 19 )   194316   2007年

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    掲載種別:研究論文(学術雑誌)  

  • Anisotropic bulletlike emission of terminal ethynyl fragment ions: Ionization of ethynylbenzene- d under intense femtosecond laser fields 査読

    Tomoyuki Yatsuhashi, Masanao Murakami, Nobuaki Nakashima

    Journal of Chemical Physics   126 ( 19 )   2007年( ISSN:0021-9606

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    掲載種別:研究論文(学術雑誌)  

    The authors investigated Coulomb explosions of ethynylbenzenes under intense femtosecond laser fields. Deuteration on the edge of the triple bond gave information about specific fragment emissions and the contribution of hydrogen migration. Some fragments not resulting from migration were emitted in the direction of laser polarization. These were ethynyl fragment ions (D+, C D+, C2 D+, and C3 D+). Although two bonds have to be cleaved to produce C3 D+, the rigid character of the triple bond was maintained in the Coulomb explosion process. In contrast, fragment ions, which are formed after single or double hydrogen migration, showed isotropic emissions with distinct kinetic energies. The character of the substituents has been found to hold even under strong laser light fields where violent fragmentation took place. The ethynyl parts were emitted like bullets from the molecular frame of ethynylbenzene despite the explosion into pieces of the main body of benzene ring. © 2007 American Institute of Physics.

    DOI: 10.1063/1.2738468

  • Ultrafast relaxation and coherent oscillations in aminobenzonitriles in the gas phase probed by intense-field ionization 査読

    Werner Fuß, Wolfram E. Schmid, Kumbil Kuttan Pushpa, Sergei A. Trushin, Tomoyuki Yatsuhashi

    Physical Chemistry Chemical Physics   9 ( 10 )   1151 - 1169   2007年( ISSN:1463-9076

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    掲載種別:研究論文(学術雑誌)  

    4-Aminobenzonitrile derivatives have two excited states of similar energy: besides the benzene-like Lb state (also termed "locally excited" or LE state) one with charge-transfer (CT) character that is slightly higher in the isolated molecules. The CT state can be lowered by solvents of suitable polarity, so that dual fluorescence can be observed in them. It is controversial along which coordinate this state is displaced, although the amino-group twist is a wide-spread assumption. We investigated a number of such compounds by transient ionization in the gas phase, initially exciting the higher-lying La state (S2). Here we briefly review the previous results on 4-(dimethylamino)benzonitrile (the prototype of this class of molecules), 4-piperidino-, pyrrolidino- and pyrrolyl-benzonitrile and compare them with new results on 4-aminobenzonitrile and on the bridged derivative N-methyl-6-cyano-1,2,3,4-tetrahydroquinoline (NMC6). Although in the latter two molecules the CT state has never been detected before, we find the same relaxation path for all compounds: From S2, the wave packet passes through a conical intersection (CI); from there part of it reaches the S1 (Lb) state directly, whereas another part temporarily populates the CT state (also in NMC6), from where it goes around the CI also to the Lb well. The wave packet directly reaching the Lb well oscillates there along coordinates involving amino-group twist and wagging or molecular arching and a quinoidal distortion. These coordinates must be components of the CI displacement vector. A vibration involving bond-length alternation of the benzene ring is ascribed to a momentum caused by the electronic symmetry change in the CI, i.e., to the nonadiabatic coupling vector. Also the CT state involves amino-group twist, as to conclude from the anisotropy of the corresponding signal. The six-membered aliphatic ring in NMC6 hinders the twist and raises the CT state to an energy that is, however, still below the La state, so that it can be temporarily populated in a barrierless process. Also in aminobenzonitrile the CT state is between L a and Lb and is reached from La without a barrier. The twist is rationalized by vibronic interaction with a higher state that is π-antibonding between the amino group and the aromatic ring. This journal is © the Owner Societies.

    DOI: 10.1039/b611877a

  • Intact molecular ion formation of some organic molecules by femtosecond lasers 査読

    Nobuaki Nakashima, Tomoyuki Yatsuhashi

    Springer Series in Chemical Physics   85   25 - 41   2007年( ISSN:0172-6218

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    掲載種別:研究論文(国際会議プロシーディングス)  

    Ionization of organic molecules irradiated with intense infrared femtosecond pulses is explained from the perspective of intact molecular ion formation. Although fragmentation is more suppressed in general by femtosecond pulse excitation than pico- and nanosecond pulse excitations, molecules are still often heavily fragmented. Among the excitation parameters affecting ionization and fragmentation processes, excitation wavelengths and pulse durations at a fixed laser intensity have been found to drastically change ionization patterns. Intact molecular ions are produced when the wavelengths are non-resonant with the electronic levels of cations, whereas fragmentation proceeds to a large extent when the wave length is resonant with the electronic transitions. An ultimately short pulse presumably leads to the formation of fragment-free ions. Time-of-flight spectra of femtosecond pulse ionization of cyclohexadiene isomers, 2,3-dimethyl-1,3-butadiene, naphthalene, anthracene, and dioxin are presented. The great advantage of femtosecond laser mass spectrometry (FLMS) for the intact molecular ion formation is shown by referring briefly to the results obtained for dioxin. Some details of the experimental methods, such as a method of estimating irradiation intensity, are described. © 2007 Springer-Verlag.

    DOI: 10.1007/978-3-540-38156-3-2

  • Enhancement of anthracene fragmentation by circularly polarized intense femtosecond laser pulse 査読

    Masanao Murakami, Michinori Tanaka, Tomoyuki Yatsuhashi, Nobuaki Nakashima

    Journal of Chemical Physics   126 ( 10 )   2007年( ISSN:0021-9606

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    掲載種別:研究論文(学術雑誌)  

    The authors compared circularly and linearly polarized lights in the ionization and fragmentation of anthracene, using 800 nm femtosecond laser pulses at intensities of 1013 - 1015 W cm-2. Singly and doubly charged intact molecular ions as well as numerous fragment ions were observed in the mass spectra, which were investigated as a function of laser intensity and polarization. At comparable intensities above the saturation threshold for complete ionization, the fragmentation pathways are enhanced with a circularly polarized field compared to a linearly polarized field. Resonant excitation of the molecular cation through the Au2 Bg2 transition is proposed to be the initial step to ion fragmentation. The circularly polarized field interacts with a larger fraction of the randomly oriented molecules than the linearly polarized field, and this is considered to be the reason for the enhanced fragmentation brought about by circularly polarized light. © 2007 American Institute of Physics.

    DOI: 10.1063/1.2713107

  • Atomiclike ionization and fragmentation of a series of C H3 -X (X: H, F, Cl, Br, I, and CN) by an intense femtosecond laser 査読

    Michinori Tanaka, Masanao Murakami, Tomoyuki Yatsuhashi, Nobuaki Nakashima

    Journal of Chemical Physics   127 ( 10 )   2007年( ISSN:0021-9606

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    掲載種別:研究論文(学術雑誌)  

    Methane derivatives of C H3 -X (X: H, F, Cl, Br, I, and CN) were ionized and fragmented by an intense femtosecond laser with a 40 fs pulse at 0.8 μm in intensities of 1013 - 1015 W cm-2. The curves of the ionization yields of C H3 -X versus laser intensities have been found to be fitted with an atomic ionization theory (the theory of Perelomov, Popov, and Terent'ev) that has been established to reproduce experimental results well for rare gas atoms. The saturation intensities have been reproduced within a factor of 1.6 of the calculated ones. For molecules with low ionization potentials such as amines, another atomic ionization theory (the theory of Ammosov, Delone, and Krainov) reproduced the saturation intensities. The atomiclike ionization behavior of molecules indicates that the fragmentation occurs after the ionization. The fragmentation mechanisms after the ionization of some molecular ions are discussed. © 2007 American Institute of Physics.

    DOI: 10.1063/1.2764078

  • Intact molecular ion formation of cyclohexane and 2,3-dimethyl-1,3-butadiene by excitation with a short, intense ferntosecond laser pulse 査読

    Tanaka Michinori, Panja Subhasis, Murakami Masanao, Yatsuhashi Tomoyuki, Nakashima Nobuaki

    CHEMICAL PHYSICS LETTERS   427 ( 4-6 )   255 - 258   2006年08月( ISSN:0009-2614

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.cplett.2006.06.065

  • Intact molecular ion formation of cyclohexane and 2,3-dimethyl-1,3-butadiene by excitation with a short, intense femtosecond laser pulse 査読

    Michinori Tanaka, Subhasis Panja, Masanao Murakami, Tomoyuki Yatsuhashi, Nobuaki Nakashima

    Chemical Physics Letters   427 ( 4-6 )   255 - 258   2006年08月( ISSN:0009-2614

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    掲載種別:研究論文(学術雑誌)  

    Cyclohexane and 2,3-dimethyl-1,3-butadiene (DMBD) were ionized and fragmented by 0.8 μm femtosecond pulses with a typical intensity of 4 × 1013 W cm-2, which were resonant with the cation absorption of cyclohexane and DMBD. Their intact molecular ions were dominant at a pulse duration of 15 fs, whereas the molecules were heavily fragmented by excitation at 205-210 fs. Possible reasons for the formation of intact molecular ions by a short pulse are discussed in terms of the vibrational periods of excited precursor states. © 2006 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cplett.2006.06.065

  • Femtosecond laser ionization of organic amines with very low ionization potentials: Relatively small suppressed ionization features 査読

    Yatsuhashi T, Obayashi T, Tanaka M, Murakami M, Nakashima N

    JOURNAL OF PHYSICAL CHEMISTRY A   110 ( 25 )   7763 - 7771   2006年06月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jp0619989

  • Femtosecond laser ionization of organic amines with very low ionization potentials: Relatively small suppressed ionization features 査読

    Tomoyuki Yatsuhashi, Takashi Obayashi, Michinori Tanaka, Masanao Murakami, Nobuaki Nakashima

    Journal of Physical Chemistry A   110 ( 25 )   7763 - 7771   2006年06月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    We examined the femtosecond nonresonant ionization of organic amines with vertical ionization potentials as low as 5.95 eV. The quantitative evaluation of suppressed ionization relative to the single active electron approximation model was done by comparing the saturation intensity, Isat, in experiments and theory. ADK theory was found to be useful in predicting the ionization yield in the Isat scale within a factor of 2, even for molecules with very low ionization potentials. The degree of suppression was, however, smaller than that of benzene. The localization of electrons on the nitrogen atom was found to affect the ionization behavior under the strong laser field. The delocalized π electrons in benzene could not follow the laser field adiabatically, while those in localized molecular orbitals could. In addition, the growth of a tunneling barrier due to the screening effect in amines may be relatively smaller than that in benzene. © 2006 American Chemical Society.

    DOI: 10.1021/jp0619989

  • Intact Molecular Ion Formation of Cyclohexane and 2,3-Dimethyl-1,3-diene by Excitation with a Short, Intense Femtosecond Laser Pulse

    Tanaka, M.; Panja, S.; Murakami, M.; Yatsuhashi, T.; Nakashima, N

    Chem. Phys. Lett.   427 ( 42831 )   255 - 258   2006年

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    掲載種別:研究論文(学術雑誌)  

  • Femtosecond Laser Ionization of Organic Amines with Very Low Ionization Potentials: Relatively Small Suppressed Ionization Features

    Yatsuhashi, T.; Obayashi, T.; Tanaka, M.; Murakami, M.; Nakashima, N.

    J. Phys. Chem. A   110 ( 25 )   7763 - 7771   2006年

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    掲載種別:研究論文(学術雑誌)  

  • Ionization and fragmentation of some organic molecules with intense femtosecond laser pulses

    Nakashima, N., Yatsuhashi, T., Murakami, M., Mizoguchi, R., Shimada, Y.

    Advances In Multi-photon Processes And Spectroscopy, Vol 17   2006年

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1142/9789812707154_0003

  • Effects of polarization of 1.4 mu m femtosecond laser pulses on the formation and fragmentation of naphthalene molecular ions compared at the same effective ionization intensity 査読

    Yatsuhashi T, Nakashima N

    JOURNAL OF PHYSICAL CHEMISTRY A   109 ( 42 )   9414 - 9418   2005年10月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jp053868q

  • Effects of polarization of 1.4 μm femtosecond laser pulses on the formation and fragmentation of naphthalene molecular ions compared at the same effective ionization intensity 査読

    Yatsuhashi T, Nakashima N

    Journal of Physical Chemistry A   109 ( 42 )   9414 - 9418   2005年10月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jp053868q

  • One- and two-photon-induced ring-cleavage reactions of strained benzocycloalkenes via hot molecules 査読

    Yatsuhashi T, Touma S, Nakashima N

    JOURNAL OF PHYSICAL CHEMISTRY A   109 ( 31 )   6847 - 6851   2005年08月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1021/jp0516947

  • One- and two-photon-induced ring-cleavage reactions of strained benzocycloalkenes via hot molecules 査読

    Tomoyuki Yatsuhashi, Shoko Touma, Nobuaki Nakashima

    Journal of Physical Chemistry A   109 ( 31 )   6847 - 6851   2005年08月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    The ring-cleavage reactions of a series of benzocycloalkenes were studied using an ArF excimer laser. Product formation was significantly suppressed in the presence of nitrogen; therefore, the presence of vibrationally excited states (hot molecules), as intermediates, was indicated. The product of highly strained benzocyclobutene was linearly proportional to the laser fluence, whereas those of benzocyclopentene and benzocyclohexene were proportional to the square of the laser fluence in the presence of nitrogen. These phenomena cannot be understood as photochemical bond cleavage in the electronic excited state, but instead appear to be the result of single- and two-photon reactions of hot molecules. The dissociation rate constants were evaluated by a statistical rate theory under the assumption that the reaction occurred from the hot molecule. The reaction rate of highly strained benzocyclobutene was predicted to be faster than the collisional rate with foreign gas, even if it had vibrational energy equivalent to one photon; however, the reaction rates of less strained benzocyclohexene were expected to compete with the collisional rate when the vibrational energy was equivalent to two photons. Benzocyclopentene was an intermediate case and showed both single- and two-photon reactions. The dissociation rate constant of 1.4 × 106 s-1 was successfully obtained from benzocyclopentene under collision-free conditions. This value was in fair agreement with the calculated value. The different dissociation rate constants of the molecules were well-explained in terms of the strain energy. Although the strain energy varies in a wide range (10-130 kJ mol-1), the simple model of the calculations reproduced the observed values of the CH2-CH2 bond dissociation in strained benzocycloalkenes. © 2005 American Chemical Society.

    DOI: 10.1021/jp0516947

  • 高強度フェムト秒レーザーと分子の相互作用 : イオン化の基礎過程とその応用 : イオン化波長効果 査読

    八ッ橋 知幸, 中島 信昭

    光化学協会 光化学 = Photochemistry   36 ( 1 )   10 - 19   2005年05月( ISSN:09134689

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    掲載種別:研究論文(学術雑誌)  

    CiNii Article

  • Formation of 1,3-hexadiene-5-yne by two-photon chemistry of benzene via hot molecule 査読

    Honjo Y, Kinoshita T, Yatsuhashi T, Nakashima N

    JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY   171 ( 3 )   223 - 229   2005年05月( ISSN:1010-6030

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.jphotochem.2004.10.008

  • Formation of 1,3-hexadiene-5-yne by two-photon chemistry of benzene via hot molecule 査読

    Yasuko Honjo, Takamasa Kinoshita, Tomoyuki Yatsuhashi, Nobuaki Nakashima

    Journal of Photochemistry and Photobiology A: Chemistry   171 ( 3 )   223 - 229   2005年05月( ISSN:1010-6030

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    掲載種別:研究論文(学術雑誌)  

    The two-photon chemistry of gaseous benzene was studied by laser flash photolysis using an ArF laser (193 nm) pumping to the S2 state. The major product was assigned to 1,3-hexadiene-5-yne, and one of the minor products was the phenyl radical. The formation mechanism is suggested to be as follows: hot benzene (S0** is formed by internal conversion from the S2 state, and hot benzene with two-photon energy (S0***) is formed from an excited state of S0**. S0*** is produced by a two-photon process, and its internal energy reaches 1243 kJ/mol. 1,3-Hexadiene-5-yne can form at rates much faster than the collision frequency (∼1010 s-1) under benzene 0.53 kPa in the presence of 51 kPa of propane. Collisional cooling is expected to quench the slow processes from S0** as well as the decomposition of 1,3-hexadiene-5-yne. 1,3-Hexadiene-5-yne and the phenyl radical can be the primary products of the two-photon fragments, which have been found by a multimass ion imaging technique. © 2004 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.jphotochem.2004.10.008

  • 高強度フェムト秒レーザーと分子の相互作用:イオン化の基礎過程とその応用 ~イオン化波長効果~

    八ッ橋知幸、中島信昭

    光化学(光化学協会会誌)   36 ( 1 )   10 - 19   2005年05月

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    共著区分:単著  

  • Coulomb explosion of hexa-fluorobenzene induced by an intense laser field 査読

    Seiji Shimizu, Vasilii Zhakhovskii, Masanao Murakami, Michinori Tanaka, Tomoyuki Yatsuhashi, Shinichiro Okihara, Katsunobu Nishihara, Shuji Sakabe, Yasukazu Izawa, Nobuaki Nakashima

    Chemical Physics Letters   404 ( 4-6 )   379 - 383   2005年03月( ISSN:0009-2614

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    掲載種別:研究論文(学術雑誌)  

    Coulomb explosion of hexa-fluorobenzene in an intense laser field (1.0 × 1016 W cm-2) was investigated using time-of-flight (TOF) mass spectrometry. The fluorine ions were mainly ejected parallel to the laser polarization, whereas the carbon ions were broadly distributed. The angular distribution features were totally different from those of benzene. Molecular dynamics simulations indicated that the substitution of fluorine atoms and/or ions caused ultrafast deformation of the carbon framework during the explosion. The effect of molecular alignment induced by the intense laser field is discussed. © 2005 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cplett.2005.01.119

  • Coulomb explosion of hexa-fluorobenzene induced by an intense laser field 査読

    Shimizu S, Zhakhovskii V, Murakami M, Tanaka M, Yatsuhashi T, Okihara S, Nishihara K, Sakabe S, Izawa Y, Nakashima N

    CHEMICAL PHYSICS LETTERS   404 ( 4-6 )   379 - 383   2005年03月( ISSN:0009-2614

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.cplett.2005.01.119

  • Ionization and fragmentation of anthracene with an intense femtosecond laser pulse at 1.4 mu m 査読

    Murakami M, Mizoguchi R, Shimada Y, Yatsuhashi T, Nakashima N

    CHEMICAL PHYSICS LETTERS   403 ( 4-6 )   238 - 241   2005年02月( ISSN:0009-2614

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.cplett.2005.01.008

  • Ionization and fragmentation of anthracene with an intense femtosecond laser pulse at 1.4 μm 査読

    Murakami M, Mizoguchi R, Shimada Y, Yatsuhashi T, Nakashima N

    Chemical Physics Letters   403 ( 4-6 )   238 - 241   2005年02月( ISSN:0009-2614

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1016/j.cplett.2005.01.008

  • Detection of dioxins by femtosecond laser ionization mass spectrometry 査読

    Shimada Y, Mizoguchi R, Shinohara H, Yatsuhashi T, Nakashima N

    BUNSEKI KAGAKU   54 ( 2 )   127 - 134   2005年02月( ISSN:0525-1931

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    掲載種別:研究論文(学術雑誌)  

  • フェムト秒レーザーを用いるダイオキシン類のイオン化

    島田義則、溝口竜二、篠原秀則、八ッ橋知幸、中島信昭

    分析化学   54 ( 2 )   127 - 134   2005年02月

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    共著区分:単著  

  • フェムト秒レーザーイオン化法によるダイオキシン類の検出 査読

    島田 義則, 溝口 竜二, 篠原 秀則, 八ッ橋 知幸, 中島 信昭

    分析化学   54 ( 2 )   127 - 134   2005年02月( ISSN:0525-1931

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    掲載種別:研究論文(学術雑誌)  

    フェムト秒レーザーイオン化質量分析法(FLMS)を塩素無置換ビフェニル,ジベンゾ-<i>p</i> -ダイオキシン及び3塩化ビフェニル,ジベンゾ-<i>p</i> -ダイオキシンのイオン化に初めて適用した.FLMSでは試料のフラグメント化を抑制し,分子イオン(intact molecular ion)比率を向上させることができ,共鳴多光子イオン化法(REMPI)では困難な多塩素置換体のイオン化にも適用できることを示した. FLMSを微量分析装置として用いるため,分子イオン数/トータルイオン数比(<i>P</i>/<i>T</i> 比)に注目して実験を行った.<i>P</i>/<i>T</i> 比はレーザー強度を増加させると,フラグメント化が顕著となり<i>P</i>/<i>T</i> 比は低下した.塩素無置換分子ではレーザー波長の依存性が顕著であった.3塩化試料では,塩素解離エネルギーが低いため,イオン化を行う際に塩素の解離が生じ,その後,塩素の解離が引き金となり,試料のフラグメント化が促進されると考えられる.その結果,レーザー波長依存性は塩素置換なし試料と比べると<i>P</i>/<i>T</i> 比は低下した. 本実験条件内において,2,2',5-トリクロロビフェニルをイオン化させる条件は,レーザー強度3.0×10<sup>13</sup> W/cm<sup>2</sup>,レーザー波長2000 nm近傍が適当である.1,3,6-トリクロロジベンゾ-<i>p</i> -ダイオキシンをイオン化させる条件は,レーザー強度3.3×10<sup>13</sup> W/cm<sup>2</sup>,レーザー波長1500 nm近傍が適当である.<br>

    DOI: 10.2116/bunsekikagaku.54.127

    CiNii Article

  • Formation of 1,3-Hexadiene-5-yne by Two-Photon Chemistry of Benzene via Hot Molecule

    Honjyo, Y.; Kinoshita, T.; Yatsuhashi, T.; Nakashima, N.

    J. Photochem. Photobiol. A   171 ( 3 )   223 - 229   2005年

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    掲載種別:研究論文(学術雑誌)  

  • 高強度フェムト秒レーザーによる有機分子のイオン化 査読

    八ッ橋 知幸, 島田 義則, 中島 信昭

    The Laser Society of Japan レーザー研究   33 ( 0 )   12 - 13   2005年( ISSN:0387-0200

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.2184/lsj.33.12

    CiNii Article

  • フェムト秒レーザーイオン化法によるダイオキシン類の検出 査読

    島田 義則, 溝口 竜二, 篠原 秀則, 八ツ橋 知幸, 中島 信昭

    日本分析化学会 分析化学   54 ( 2 )   127 - 134   2005年( ISSN:05251931

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    掲載種別:研究論文(学術雑誌)  

    フェムト秒レーザーイオン化質量分析法(FLMS)を塩素無置換ビフェニル, ジベンゾ-p-ダイオキシン及び3塩化ビフェニル, ジベンゾ-p-ダイオキシンのイオン化に初めて適用した.FLMSでは試料のフラグメント化を抑制し, 分子イオン(intact molecular ion)比率を向上させることができ, 共鳴多光子イオン化法(REMPI)では困難な多塩素置換体のイオン化にも適用できることを示した.FLMSを微量分析装置として用いるため, 分子イオン数/トータルイオン数比(P/T比)に注目して実験を行った.P/T比はレーザー強度を増加させると, フラグメント化が顕著となりP/T比は低下した.塩素無置換分子ではレーザー波長の依存性が顕著であった.3塩化試料では, 塩素解離エネルギーが低いため, イオン化を行う際に塩素の解離が生じ, その後, 塩素の解離が引き金となり, 試料のフラグメント化が促進されると考えられる.その結果, レーザー波長依存性は塩素置換なし試料と比べるとP/T比は低下した.本実験条件内において, 2, 2′, 5-トリクロロビフェニルをイオン化させる条件は, レーザー強度3.0×10^<13>W/cm^2, レーザー波長2000 nm近傍が適当である.1, 3, 6-トリクロロジベンゾ-p-ダイオキシンをイオン化させる条件は, レーザー強度3.3×10^<13>W/cm^2, レーザー波長1500 nm近傍が適当である.

    DOI: 10.2116/bunsekikagaku.54.127

    CiNii Article

  • The effects of polarization of 1.4 μm femtosecond laser pulses on the formation and fragmentation of naphthelene moelcular ions compared at the same effective ionization intensity

    Yatsuhashi, T.; Nakashima, N.

    J. Phys. Chem. A   109 ( 42 )   9414 - 9418   2005年

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    掲載種別:研究論文(学術雑誌)  

  • One- and Two-photon-Induced Ring-Cleavage Reactions of Strained Benzocycloalkenes via Hot Molecules

    Yatsuhashi, T.; Touma, S.; Nakashima, N.

    J. Phys. Chem. A.   109 ( 31 )   6847 - 6851   2005年

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    掲載種別:研究論文(学術雑誌)  

  • Ionization and Fragmentation of Anthracene with an Intense Femtosecond Laser Pulse at 1.4 μm

    Murakami, M.; Mizoguchi, R.; Shimada, Y.; Yatsuhashi, T.; Nakashima, N.

    Chem. Phys. Lett.   403 ( 42831 )   238 - 241   2005年

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    掲載種別:研究論文(学術雑誌)  

  • Coulomb Explosion of Hexa-fluorobenzene Induced by an Intense Laser Field

    S. Shimizu, V. Zhakhovskii, M. Murakami, M.Tanaka, T. Yatsuhashi et al.

    Chem. Phys. Lett.   404 ( 42831 )   379 - 383   2005年

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    掲載種別:研究論文(学術雑誌)  

  • フェムト秒レーザーを用いるダイオキシン類のイオン化

    島田義則、溝口竜二、篠原秀則、八ッ橋知幸、中島信昭

    分析化学   54 ( 2 )   127 - 134   2005年

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    掲載種別:研究論文(学術雑誌)  

  • 高強度フェムト秒レーザーによる有機分子のイオン化

    八ッ橋 知幸, 島田 義則, 中島 信昭

    レーザー研究   33 ( Supplement )   12 - 13   2005年( ISSN:03870200

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  • フェムト秒レーザーのパルス幅変化による有機分子のイオン化および解離過程 査読

    溝口竜二, 島田義則, 篠原秀則, 八ッ橋知幸, 中島信昭

    レーザー研究(レーザー学会会誌)   32 ( 11 )   717 - 721   2004年11月( ISSN:0387-0200

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    The ionization and fragmentation of 2,3-dimethyl-1,3-butadiene of a femtosecond laser have been studied at various pulse durations, which were changed from 35 fs to 1 ps. A reflectron-type time of flight mass spectrometer (TOF-MS) was used for ion detection. Molecules were ionized under a strong laser field and formed parent ions. Some were fragmented, resulting in a drastic increase of ionic species. Fragmentation was dominant when a long duration pulse was used, probably because the parent and large fragmented ions were further decomposed into small fragmented ions. Such heavy fragmentation may cause an underestimation of I<sub>sat</sub>.

    DOI: 10.2184/lsj.32.717

    CiNii Article

    その他URL: https://jlc.jst.go.jp/DN/JALC/00244141255?from=CiNii

  • Probing of coherent oscillations by multiphoton ionization

    S. A. Trushin, W. Fuß, W. E. Schmid, T. Yatsuhashi

    Femtochemistry and Femtobiology: Ultrafast Events in Molecular Science   299 - 302   2004年04月

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    © 2004 Elsevier B.V. All rights reserved. Pumping a molecule by a femtosecond, pulse to an electronically excited state S2 creates a vibrational wave packet in this state. Ultrafast internal conversion through a conical intersection may give rise to a periodic motion in a lower potential well, which can be observed as a coherent oscillation in pump-probe spectroscopy. If the slope on entering the well excites the vibration, its assignment gives information on the relaxation or reaction path direction. In the experiment in this chapter the molecules are excited to the S2 (La, symmetry 2A) state by a 70 fs pulse at 270 nm. The La and CT states are just two locations on one potential energy surface (PES), and the Lb PES in the form of a conical intersection (CI) crosses this surface. The wave packet passes through the CI and branches there. The one entering first into the S1 well oscillates there coherently, whereas the other arriving later from the CT state seems to have lost its coherence. The vibration is assigned in PIPBN to amino-group wagging (planarization/pyramidalization) in S1.

    DOI: 10.1016/B978-044451656-5/50061-X

  • Probing of coherent oscillations by multiphoton ionization 査読

    S. A. Trushin, W. Fuß, W. E. Schmid, T. Yatsuhashi

    Femtochemistry and Femtobiology: Ultrafast Events in Molecular Science   299 - 302   2004年04月

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    掲載種別:論文集(書籍)内論文  

    © 2004 Elsevier B.V. All rights reserved. Pumping a molecule by a femtosecond, pulse to an electronically excited state S2 creates a vibrational wave packet in this state. Ultrafast internal conversion through a conical intersection may give rise to a periodic motion in a lower potential well, which can be observed as a coherent oscillation in pump-probe spectroscopy. If the slope on entering the well excites the vibration, its assignment gives information on the relaxation or reaction path direction. In the experiment in this chapter the molecules are excited to the S2 (La, symmetry 2A) state by a 70 fs pulse at 270 nm. The La and CT states are just two locations on one potential energy surface (PES), and the Lb PES in the form of a conical intersection (CI) crosses this surface. The wave packet passes through the CI and branches there. The one entering first into the S1 well oscillates there coherently, whereas the other arriving later from the CT state seems to have lost its coherence. The vibration is assigned in PIPBN to amino-group wagging (planarization/pyramidalization) in S1.

    DOI: 10.1016/B978-044451656-5/50061-X

  • Single-, two- and three VUV photon reactions of a series of alkylarenes in the gas phase 査読

    Tomoyuki Yatsuhashi, Nobuaki Nakashima

    Journal of Photochemistry and Photobiology A: Chemistry   162 ( 2-3 )   481 - 487   2004年03月( ISSN:1010-6030

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    掲載種別:研究論文(学術雑誌)  

    A series of alkylarenes (AR) was excited by an ArF excimer laser in the gas phase. The neutral radical was observed by transient absorption spectroscopy without traces of emission, triplet state, or cation radical. Single and multiphoton (up to three-photon) processes were observed even though molecules have similar structures. This presents a quite different feature from ordinary photochemistry in the condensed phase. Neutral radical production was explained well by the hot molecule mechanism and compared with statistical reaction theory. The differences between multiphoton reactions in the condensed phase and those in the gas phase were discussed. © 2004 Elsevier B.V. All rights reserved.

    DOI: 10.1016/S1010-6030(03)00389-7

  • フェムト秒質量分析法

    中島信昭、八ッ橋知幸、篠原秀則、島田義則

    応用物理(応用物理学会会誌)   73 ( 2 )   215 - 219   2004年02月

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    共著区分:単著  

  • Ultrafast charge transfer and coherent oscillations in 4-piperidino- benzonitrile 査読

    T. Yatsuhashi, S. A. Trushin, W. Fuß, W. Rettig, W. E. Schmid, S. Zilberg

    Chemical Physics   296 ( 1 )   1 - 12   2004年01月( ISSN:0301-0104

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    掲載種別:研究論文(学術雑誌)  

    The La-like S2 state of 4-(1-piperidino) -benzonitrile and the corresponding 3,5-dimethyl-piperidino derivative was excited at 270 nm in the gas phase at 130°C. Nonresonant multiphoton ionization at infrared wavelengths (810 and 1300 nm) with mass-selective detection of the ion yields then probed the subsequent processes. Two groups of time constants were found: in the range <2 ps and in the 100 ps range. In addition, a coherent oscillation with period 1.06 and 1.18 ps for the unsubstituted and substituted species were monitored until about 10 ps. The sub-picosecond time constants can be assigned to relaxation from S2 through a conical intersection to both S1 (Lb-like) and a charge transfer (CT) state. These two states then equilibrate within about 1.9 ps. The oscillation must be a vibration in Lb, because this is the only state still populated at 10 ps. It is suggested to assign it to the amino-group wagging (planarization/pyramidalization). It indicates a component of the direction into which the conical intersection is displaced from the Lb minimum. The ultrafast relaxation times suggest, however, that additional coordinates are involved in the process, probably amino-group twist and bond stretching in the benzene ring. © 2003 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.chemphys.2003.09.011

  • フェムト秒レーザーのパルス幅変化による有機分子のイオン化および解離過程

    溝口竜二, 島田義則, 篠原秀則, 八ッ橋知幸, 中島信昭

    レーザー研究   32 ( 11 )   717 - 721   2004年( ISSN:0387-0200|1349-6603

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  • Ultrafast temporary charge transfer in pyrrolidinyl-benzonitrile and pyrrolyl-benzonitrile in the gas phase

    Fuß W, Rettig W, Schmid W.E, Trushin S.A, Yatsuhashi T.

    Faraday Discussions   127   23 - 33   2004年

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  • Ultrafast charge transfer and coherent oscillations in 4-piperidino- benzonitrile

    Yatsuhashi T, Trushin S.A, Fuß W, Rettig W, Schmid W.E, Zilberg S.

    Chemical Physics   296 ( 1 )   1 - 12   2004年

  • Probing of coherent oscillations by multiphoton ionization

    Trushin, S. A.; Fuss, W.; Schmid, W. E.; Yatsuhashi, T.

    Elsevier Science, Femtochemistry and Femtobiology: Ultrafast Events in Molecular Science   299 - 302   2004年( ISBN:444516565

  • フェムト秒レーザーのパルス幅変化による有機分子のイオン化および解離過程

    溝口竜二、島田義則、篠原秀則、八ッ橋知幸、中島信昭

    レーザー研究   32 ( 11 )   717 - 721   2004年

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    掲載種別:研究論文(学術雑誌)  

  • Ultrafast Temporary Charge Transfer in Pyrrolidinyl-benzonitrile and Pyrrolyl-benzonitrile in the Gas Phase

    Fuss, W.; Rettig, W.; Schmid, W. E.; Trushin, S. A.; Yatsuhashi, T.

    Faraday Discuss.   127   23 - 33   2004年

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    掲載種別:研究論文(学術雑誌)  

  • Single-, Two- and Three VUV photon Reactions of a Series of Alkylarenes inthe Gas Phase

    Yatsuhashi T.; Nakashima, N.

    J. Photochem. Photobiol. A   162 ( 42769 )   481 - 487   2004年

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    掲載種別:研究論文(学術雑誌)  

  • Ultrafast Charge Transfer and Coherent Oscillations in 4-Piperidino-benzonitrile

    Yatsuhashi et al.

    Chem. Phys.   296   1 - 12   2004年

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    掲載種別:研究論文(学術雑誌)  

  • Single-, two- and three VUV photon reactions of a series of alkylarenes in the gas phase

    Yatsuhashi T, Nakashima N.

    Journal of Photochemistry and Photobiology A: Chemistry   162 ( 2-3 )   481 - 487   2004年

  • Ultrafast temporary charge transfer in pyrrolidinyl-benzonitrile and pyrrolyl-benzonitrile in the gas phase 査読

    Werner Fuß, Wolfgang Rettig, Wolfram E. Schmid, Sergei A. Trushin, Tomoyuki Yatsuhashi

    Faraday Discussions   127   23 - 33   2004年( ISSN:1359-6640

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    掲載種別:研究論文(国際会議プロシーディングス)  

    4-(N-pyrrolidinyl)benzonitrile and 4-(N-pyrrolyl)benzonitrile were excited by an ultrashort pulse at 270 nm to their La (S2) states and then probed by ionization at long wavelengths. Parent and fragment ion signals show components with time constants < 100 fs which we attribute to ultrafast relaxation to the Lb (S1) state. From this short time we infer a conical intersection between the Lb and L a surfaces. The wave packet can branch there, one part going temporarily to a strongly displaced state. Its shift was concluded from an anisotropy observed only there. The only excited state known to have a large displacement is the charge-transfer (CT) state. The positive anisotropy indicates that the CT state belongs to the 2A species for both molecules. For pyrrolylbenzonitrile, this is in contrast to previous assignments. The anisotropy, and a coherent oscillation observed in pyrrolidinylbenzonitrile, support the idea that the amino-group twist is an important component of the CT reaction coordinate.

    DOI: 10.1039/b313691d

  • Ultrafast temporary charge transfer in pyrrolidinyl-benzonitrile and pyrrolyl-benzonitrile in the gas phase 査読

    W Fuss, W Rettig, WE Schmid, SA Trushin, T Yatsuhashi

    FARADAY DISCUSSIONS   127   23 - 33   2004年( ISSN:1364-5498

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    掲載種別:研究論文(学術雑誌)  

    4-(N-pyrrolidinyl) benzonitrile and 4-(N-pyrrolyl) benzonitrile were excited by an ultrashort pulse at 270 nm to their L-a (S-2) states and then probed by ionization at long wavelengths. Parent and fragment ion signals show components with time constants &lt; 100 fs which we attribute to ultrafast relaxation to the L-b (S-1) state. From this short time we infer a conical intersection between the Lb and La surfaces. The wave packet can branch there, one part going temporarily to a strongly displaced state. Its shift was concluded from an anisotropy observed only there. The only excited state known to have a large displacement is the charge-transfer (CT) state. The positive anisotropy indicates that the CT state belongs to the 2A species for both molecules. For pyrrolylbenzonitrile, this is in contrast to previous assignments. The anisotropy, and a coherent oscillation observed in pyrrolidinylbenzonitrile, support the idea that the amino-group twist is an important component of the CT reaction coordinate.

    DOI: 10.1039/b313691d

  • Ionization and fragmentation of some chlorinated compounds and dibenzo-p-dioxin with an intense femtosecond laser pulse at 800 nm 査読

    Hideo Harada, Michinori Tamaka, Masanao Murakami, Seiji Shimizu, Tomoyuki Yatsuhashi, Nobuaki Nakashima, Shuji Sakabe, Yasukazu Izawa, Sachiko Tojo, Tetsuro Majima

    Journal of Physical Chemistry A   107 ( 34 )   6580 - 6586   2003年08月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    We detected parent and fragment ions from 14 chlorinated and a few fluorinated compounds as well as dibenzo-p-dioxin (dioxin) in intense laser fields. The irradiation pulse had an intensity from 1 × 1013 to 1 × 1015 W cm-2, with a 130-fs pulse duration at a central wavelength of 800 nm. Irradiation at this intensity led to a singly ionized species and a small amount of atomic ions, indicating the onset of Coulomb explosions. We have previously reported finding a key factor in determining the parent and/or fragment ion formations of organic hydrocarbons with an intense femtosecond laser pulse [Harada, H.; et al. Chem. Phys. Lett. 2001, 342, 563-570]. This key factor is a requirement for parent ion predominance if the excitation laser wavelength and the absorption spectra of the target cation are in nonresonance, and vice versa. Use of this factor has been found to be effective for molecules other than hexachlorobutadiene. The threshold intensities Isat at the infinity ionization rate were determined and are reasonably comparable to those of previously reported hydrocarbons.

    DOI: 10.1021/jp022626c

  • EuO Nanocrystal Formation under ArF Laser Irradiation 査読

    Yasuchika Hasegawa, Supitcha Thongchant, Tomoharu Kataoka, Yuji Wada, Tomoyuki Yatsuhashi, Nobuaki Nakashima, Shozo Yanagida

    Chemistry Letters   32 ( 8 )   708 - 709   2003年08月( ISSN:0366-7022

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    掲載種別:研究論文(学術雑誌)  

    EuO (Europium(II) oxide) nanocrystals are prepared under irradiation by means of an ArF excimer laser. The formation of EuO nanocrystals with the clear lattice fringes was confirmed by TEM image. The crystal growth was monitored by the emission spectra.

    DOI: 10.1246/cl.2003.708

  • Coherent oscillations in the charge-transfer system 4-dimethylamino-benzonitrile 査読

    S. A. Trushin, T. Yatsuhashi, W. Fuß, W. E. Schmid

    Chemical Physics Letters   376 ( 3-4 )   282 - 291   2003年07月( ISSN:0009-2614

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    掲載種別:研究論文(学術雑誌)  

    4-Dimethylamino-benzonitrile was excited in the gas phase at 270 nm into the S2 (La) state and probed by femtosecond time-resolved photoionization at 2 μm. Coherent oscillations were detected in the transient ion signal. We claim that from S2, the molecule relaxes through a conical intersection and, going backwards along the charge-transfer (CT) reaction coordinate, enters into the S1 (Lb) well, where it vibrates along the amino-group twist and inversion. Probably mainly the last slope stimulates these oscillations. We conclude that the conical intersection - and hence also the CT state - is displaced from the L b minimum in a direction containing the twist and inversion as components and that inversion is part of the nonadiabatic coupling vector. © 2003 Elsevier B.V. All rights reserved.

    DOI: 10.1016/S0009-2614(03)00979-5

  • EuO Nanocrystal Formation under ArF Laser Irradiation

    Hasegawa Y, Thongchant S, Kataoka T, Wada Y, Yatsuhashi T, Nakashima N, Yanagida S.

    Chemistry Letters   32 ( 8 )   708 - 709   2003年

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  • Coherent oscillations in the charge-transfer system 4-dimethylamino-benzonitrile

    Trushin S.A, Yatsuhashi T, Fuß W, Schmid W.E.

    Chemical Physics Letters   376 ( 3-4 )   282 - 291   2003年

  • Ionization and Fragmentation of Some Chlorinated Compounds and Dibenzo-p-dioxin with an Intense Femtosecond Laer Pulse at 800 nm

    Hideo Harada et al.

    J. Phys. Chem. A   107 ( 34 )   6580 - 6586   2003年

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    掲載種別:研究論文(学術雑誌)  

  • EuO Nanocrystal Formation under ArF Laser Irradiation

    Yasuchika Hasegawa et al.

    Chem. Lett.   32 ( 8 )   708 - 709   2003年

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    掲載種別:研究論文(学術雑誌)  

  • Coherent oscillations in the charge-transfer system 4-dimethylamino-benzonitrile

    Trushin, S.A. ; Yatsuhashi, T.; Fuss, W.; Schmid, W. E.

    Chem. Phys. Lett.   376   282 - 291   2003年

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    掲載種別:研究論文(学術雑誌)  

  • Ionization and fragmentation of some chlorinated compounds and dibenzo-p-dioxin with an intense femtosecond laser pulse at 800 nm

    Harada H, Tamaka M, Murakami M, Shimizu S, Yatsuhashi T, Nakashima N, Sakabe S, Izawa Y, Tojo S, Majima T.

    Journal of Physical Chemistry A   107 ( 34 )   6580 - 6586   2003年

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  • Radiationless deactivation process of 1-dimethylamino-9-fluorenone induced by conformational relaxation in the excited state: A new model molecule for the TICT process 査読

    Akimitsu Morimoto, László Biczók, Tomoyuki Yatsuhashi, Tetsuya Shimada, Shingo Baba, Hiroshi Tachibana, Donald A. Tryk, Haruo Inoue

    Journal of Physical Chemistry A   106 ( 43 )   10089 - 10095   2002年10月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    The deactivation process of excited 1-(dimethylamino)-9-fluorenone (1-DMAF) was investigated by means of steady-state and time-resolved fluorescence spectroscopy. Fluorescence decay profiles for 1-DMAF, which has a relatively short lifetime (several tens of picoseconds in low viscosity solvents at ambient temperature) are much affected by the fluidity of the surrounding solvent. The lifetimes increase in glassy solvents at 77 K as well as with increasing viscosity. These results indicate that conformational relaxation by the dimethylamino group plays an important role in the deactivation process of 1-DMAF. Detailed analysis of the temperature dependence of the fluorescence lifetime revealed that the conformational relaxation process has a very small intramolecular activation barrier (5.4 kJ/mol). Results of MO calculations suggest that the dimethylamino moiety of 1-DMAF is pretwisted in the ground state and that the most stable structure in the excited state is a twisted intramolecular charge transfer (TICT) state. 1-DMAF could be a new model molecule that exhibits the TICT phenomena.

    DOI: 10.1021/jp0203604

  • Coulomb explosion of benzene induced by an intense laser field 査読

    Seiji Shimizu, Vasilii Zhakhovskii, Fuminobu Sato, Shinichiro Okihara, Shuji Sakabe, Katsunobu Nishihara, Yasakazu Izawa, Tomoyuki Yatsuhashi, Nobuaki Nakashima

    Journal of Chemical Physics   117 ( 7 )   3180 - 3189   2002年08月( ISSN:0021-9606

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    掲載種別:研究論文(学術雑誌)  

    The kinetic-energy distributions of multiply charged carbon ions produced by the Coulomb explosion of benzene are reported to be highly anisotropic in the direction of the laser electric field. Specifically, the Coulomb explosion of benzene at laser intensity of 8.0 × 1016 W cm-2 and the C4+ ion and proton with large kinetic energy and at a higher angle are observed. The molecular dynamics (MD) simulations reveal that the explosion process is anisotropic for the laser electric field.

    DOI: 10.1063/1.1492275

  • Xylylene formation from vibrationally hot cyclophanes: Specific dissociation rate constants of strained molecules 査読

    Yuriko Hosoi, Tomoyuki Yatsuhashi, Ken Ohtakeyama, Seiji Shimizu, Yoshiteru Sakata, Nobuaki Nakashima

    Journal of Physical Chemistry A   106 ( 10 )   2014 - 2019   2002年03月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    Cyclophane derivatives were irradiated with an ArF excimer laser in the gas phase. No triplet states, fluorescence, or cation radicals were observed in the transient spectra. The CH2-CH2 bonds dissociated, forming corresponding xylylenes by a two-photon process. The bond dissociations were explained in terms of a multiphoton reaction of hot molecules formed by an internal conversion. In addition, a slow rise of xylylene that originated in the single photon dissociation process of hot cyclophane was observed in the case of methyl-substituted paracyclophanes under low pressure conditions. The specific reaction rates of the dissociations of highly strained paracyclophanes were well explained by a statistical reaction theory, if a simple consideration of strain energy was made in the calculations.

    DOI: 10.1021/jp0120817

  • Coulomb explosion of benzene induced by an intense laser field

    Shimizu S, Zhakhovskii V, Sato F, Okihara S, Sakabe S, Nishihara K, Izawa Y, Yatsuhashi T, Nakashima N.

    Journal of Chemical Physics   117 ( 7 )   3180 - 3189   2002年

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  • Xylylene formation from vibrationally hot cyclophanes: Specific dissociation rate constants of strained molecules

    Hosoi Y, Yatsuhashi T, Ohtakeyama K, Shimizu S, Sakata Y, Nakashima N.

    Journal of Physical Chemistry A   106 ( 10 )   2014 - 2019   2002年

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  • Radiationless Deactivation Process of 1-Dimethylamino-9-fluorenone Induced by Conformational Relaxation in the Excited State: A New Model Molecule for the TICT Process

    Akimitsu Morimoto et al.

    J. Phys. Chem. A   106 ( 43 )   10098 - 10095   2002年

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    掲載種別:研究論文(学術雑誌)  

  • Coulomb Explosion of Benzene Induced by an Intense Laser Field

    Shimizu, S. et al.

    J. Chem. Phys.   117 ( 7 )   3180 - 3189   2002年

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    掲載種別:研究論文(学術雑誌)  

  • Xylylene Formation from Vibrationally Hot Cyclophane: Specific Dissociation Rate Constants of Strained Molecules

    Hosoi, Y.; Yatsuhashi, T.; Ohtakeyama, K.; Sakata, Y.; Nakashima, N.

    J. Phys. Chem. A   106 ( 10 )   2014 - 2019   2002年

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    掲載種別:研究論文(学術雑誌)  

  • Radiationless deactivation process of 1-dimethylamino-9-fluorenone induced by conformational relaxation in the excited state: A new model molecule for the TICT process

    Morimoto A, Biczók L, Yatsuhashi T, Shimada T, Baba S, Tachibana H, Tryk D.A, Inoue H.

    Journal of Physical Chemistry A   106 ( 43 )   10089 - 10095   2002年

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  • Radiationless deactivation of an intramolecular charge transfer excited state through hydrogen bonding: Effect of molecular structure and hard-soft anionic character in the excited state 査読

    Akimitsu Morimoito, Tomoyuki Yatsuhashi, Tetsuya Shimada, Laszló Biczók, Donald A. Tryk, Haruo Inoue

    Journal of Physical Chemistry A   105 ( 45 )   10488 - 10496   2001年11月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    Energy-gap dependency for radiationless deactivation from excited states of various molecules having strong intramolecular charge transfer (ICT) character has been investigated by observing fluorescence quenching on addition of alcohols. Molecules having strong ICT excited states were classified into three groups: (a) molecules that underwent considerable fluorescence quenching by ethanol (quenching constant, K SV > 20 M -1) and for which radiationless deactivation in protic solvents was much faster than anticipated from the ordinary energy-gap law observed in aprotic solvents, (b) molecules whose fluorescence exhibited substantial red shifts, and (c) molecules whose fluorescence were barely affected by the addition of ethanol (K SV < 1 M -1) and for which the energy-gap dependences on radiationless deactivation in protic solvents were not so different from those in aprotic solvents. Typical fluorophores for each case, i.e., a, b, and c, were aminoanthraquinone, aminophthalimide, and aminocoumarin, respectively. Differences in the fluorescence quenching phenomena are discussed in terms of the molecular structure and the hard-soft anionic character of the excited states, governed by changes in charge density on the carbonyl oxygen. An excited molecule having a hard anionic character on a specific site within the molecule, classified as group a, was concluded to undergo considerable fluorescence quenching through an intermolecular hydrogen bonding interaction with an alcohol having a hard cationic character. On the other hand, fluorescence of an excited molecule having a soft anionic character, classified as group c, cannot be quenched well by an alcohol because of the weak interaction on the carbonyl oxygen. The anomalous behavior of the excited aminophthalimides (group b), which are classified as hard anions but do not undergo fluorescence quenching, suggested the possibility that molecular rigidity is another factor controlling the radiationless deactivation process induced by hydrogen bonding.

    DOI: 10.1021/jp0117213

    CiNii Article

  • A hot molecule as an intermediate in multiphoton reactions: First photoinduced reactions of biphenylene [20] 査読

    T. Yatsuhashi, T. Akiho, N. Nakashima

    Journal of the American Chemical Society   123 ( 41 )   10137 - 10138   2001年10月( ISSN:0002-7863

  • A key factor in parent and fragment ion formation on irradiation with an intense femtosecond laser pulse 査読

    Hideo Harada, Seiji Shimizu, Tomoyuki Yatsuhashi, Shuji Sakabe, Yasukazu Izawa, Nobuaki Nakashima

    Chemical Physics Letters   342 ( 5-6 )   563 - 570   2001年07月( ISSN:0009-2614

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    掲載種別:研究論文(学術雑誌)  

    Two pairs of organic molecules (2,3-dimethyl-1,3-butadiene, 2,5-dimethyl-2,4-hexadiene; 1,4-cyclohexadiene, 1,3-cyclohexadiene) were irradiated with a high-intensity 120-fs laser pulse in the intensity region of 1014 W cm-2. One molecule in each pair had no allowed electronic transition in the cation at the excitation wavelength of 800 nm, resulting in parent ion dominance. In contrast, the counter molecule, which had a similar structure but with absorption in the cation at the excitation wavelength, showed heavy fragmentation with a negligibly small signal of the parent ion. The previously reported observations are explainable on the basis of the proposed mechanism for fragmentation in femtosecond ionization. © 2001 Elsevier Science B.V.

    DOI: 10.1016/S0009-2614(01)00662-5

    CiNii Article

  • VUV laser chemistry - Formation of hot molecules and their reactions in the gas phase 査読

    T. Yatsuhashi, N. Nakashima

    Bulletin of the Chemical Society of Japan   74 ( 4 )   579 - 593   2001年04月( ISSN:0009-2673

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    掲載種別:研究論文(学術雑誌)  

    The hot molecule (S0**) is in a highly vibrationally excited state formed by rapid internal conversion from initially prepared electronic excited states. The importance and predominance of the S0** mechanism in VUV gas phase photochemistry has been demonstrated. In this account, the fundamental physicochemical properties of S0** are discussed in order to understand the characteristic features of S0** reactions, and VUV laser chemistry is reviewed from the following two points of view: 1) The generalization and classification of VUV chemistry for a variety of molecules, including the hot molecule mechanism and other competitive mechanisms; 2) A new strategy of multiphoton chemistry that employs hot molecule as an intermediate. Internal conversion is a dominant deactivation process for many molecules in the VUV region. Aromatic hydrocarbons and olefins are the representative examples of S0** reactions. However, fluorescence and intersystem crossing are major deactivation processes in some cases such as large condensed aromatic hydrocarbons. The reactions of chlorinated compounds and phenols are explained by other reaction mechanisms such as direct dissociation and predissociation. Carbonyl compounds and some amines are classified into the intermediate cases. Due to the large molar extinction coefficient and relatively long lifetime of S0**, the multiphoton absorption process can be induced by a single nanosecond laser pulse. As a result of fast internal conversion and intramolecular energy redistribution, the second photon and further photons will not be absorbed by the molecule in the electronic excited state but by that in the S0**, and the photon energy of the multiphoton is accumulated as vibrational energy. Therefore, ionization is minor process in the case of the multiphoton reaction of S0**. The neutral radical formation is predominant in the dissociation reaction, and the rate constant increases because the internal energy is multiplied by the multiphoton absorption process. The applications of these findings lie in the following: 1) Large molecules of which the single-photon hot molecule reaction rate is small; 2) Molecules which have been deemed to be photoinert.

    DOI: 10.1246/bcsj.74.579

  • Coulomb explosion of benzene in high-intensity laser fields

    Shimizu S, Yatsuhashi T, Nakashima N, Zhakhovskii V, Okihara S, Nishihara K, Izawa Y, Sato F, Sakabe S.

    Conference on Lasers and Electro-Optics Europe - Technical Digest   160 - 161   2001年

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  • Chemical Behavior of the Oxygen-radical: Quenching Process of the Cumyloxyl Radical by Nicotinamide Derivatives

    YATSUHASHI Tomoyuki

    J. Photochem. Photobiol. A   143 ( 2/3 )   141 - 145   2001年( ISSN:1010-6030

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    共著区分:単著  

    DOI: 10.1016/S1010-6030(01)00486-5

    CiNii Article

  • Chemical behavior of oxygen-radical: Quenching process of cumyloxyl radical by nicotinamide derivatives

    Sugita M, Yatsuhashi T, Shimada T, Inoue H.

    Journal of Photochemistry and Photobiology A: Chemistry   143 ( 2-3 )   141 - 145   2001年

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  • A Key Factor in Parent and Fragment Ion Formation on Irradiation with an Intense Femtosecond Laser Pulse

    YATSUHASHI Tomoyuki

    Chem. Phys. Lett.   342 ( 5/6 )   563 - 570   2001年( ISSN:0009-2614

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    共著区分:単著  

    DOI: 10.1016/S0009-2614(01)00662-5

    CiNii Article

  • A Hot Molecule as an Intermediate in Multiphoton Reaction: First Photoinduced Reaction of Biphenylene

    YATSUHASHI Tomoyuki

    J. Am. Chem. Soc   123 ( 41 )   10137 - 10138   2001年( ISSN:0002-7863

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    共著区分:単著  

    DOI: 10.1021/ja015803g

    PubMed

    CiNii Article

  • Xylylene Formation from Vibrationally Hot Cyclophane: Specific Dissociation Rate Constants of Strained Molecules

    YATSUHASHI Tomoyuki

    J. Phys. Chem. A   0 ( 0 )   0   2001年

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    共著区分:単著  

  • VUV Laser Chemistry - Formation of Hot Molecules and Their Reactions in the Gas Phase -

    Tomoyuki Yatsuhashi, Nobuaki Nakashima

    Bull.Chem.Soc.Jpn.   74 ( 4 )   579 - 593   2001年( ISSN:0009-2673|1348-0634

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  • Radiationless Deactivation of an Intramolecular Charge Transfer Excited State through Hydrogen Bonding: Effect of Molecular Structure and Hard-Soft Anionic Character in the Excited States

    Morimoto, A.; Yatsuhashi, T.; Shimada, T.; Laszl, B.; Tryk, D. A.; Inoue, H.

    J. Phys. Chem. A   105 ( 45 )   10488 - 10496   2001年

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    掲載種別:研究論文(学術雑誌)  

  • A Hot Molecule as an Intermediate in Multiphoton Reaction: First Photoinduced Reaction of Biphenylene

    Yatsuhashi, T.; Akiho, T.; Nakashima, N.

    J. Am. Chem. Soc   123 ( 41 )   10137 - 10138   2001年

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    掲載種別:研究論文(学術雑誌)  

  • Chemical Behavior of the Oxygen-radical: Quenching Process of the Cumyloxyl Radical by Nicotinamide Derivatives

    Sugita, M.; Yatsuhashi, T.; Shimada, T.; Inoue, H.

    J. Photochem. Photobiol. A   143   141 - 145   2001年

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    掲載種別:研究論文(学術雑誌)  

  • Molecular Mechanism of the Intermolecular Hydrogen Bond between 2-Piperidinoanthraquinone and Alcohol in the Excited State; Direct Observation of the Out-of-plane Mode Interaction with Alcohol by Transient Absorption Studies

    Morimoto, A.; Yatsuhashi, T.; Shimada, T.; Kumazaki, S; Yoshihara, K.; Inoue, H.

    J. Phys. Chem. A   105 ( 39 )   8840 - 8849   2001年

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    掲載種別:研究論文(学術雑誌)  

  • A Key Factor in Parent and Fragment Ion Formation on Irradiation with an Intense Femtosecond Laser Pulse

    Harada, H.; Shimizu, S.; Yatsuhashi, T.; Sakabe, S.; Izawa, Y.; Nakashima, N.

    Chem. Phys. Lett.   342   563 - 570   2001年

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    掲載種別:研究論文(学術雑誌)  

  • Molecular mechanism of the intermoiecular hydrogen bond between 2-piperidinoanthraquinone and alcohol in the excited state: Direct observation of the out-of-plane mode interaction with alcohol by transient absorption studies

    Morimoto A, Yatsuhashi T, Shimada T, Kumazaki S, Yoshihara K, Inoue H.

    Journal of Physical Chemistry A   105 ( 39 )   8840 - 8849   2001年

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  • Radiationless Deactivation of an Intramolecular Charge Transfer Excited State through Hydrogen Bonding: Effect of Molecular Structure and Hard-Soft Anionic Character in the Excited States

    YATSUHASHI Tomoyuki

    J. Phys. Chem. A   105 ( 45 )   10488 - 10496   2001年( ISSN:1089-5639

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    共著区分:単著  

    DOI: 10.1021/jp0117213

    CiNii Article

  • Photoionization of polychlorinated compounds with an intense femtosecond laser pulse

    Harada H, Shimizu S, Yatsuhashi T, Nakashima N, Sakabe S, Izawa Y.

    Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest   2   2001年

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  • Molecular Mechanism of the Intermolecular Hydrogen Bond between 2-Piperidinoanthraquinone and Alcohol in the Excited State; Direct Observation of the Out-of-plane Mode Interaction with Alcohol by Transient Absorption Studies

    YATSUHASHI Tomoyuki

    J. Phys. Chem. A   105 ( 39 )   8840 - 8849   2001年( ISSN:1089-5639

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    共著区分:単著  

    DOI: 10.1021/jp004560w

    CiNii Article

  • Coulomb explosion of benzene in high-intensity laser fields 査読

    S. Shimizu, T. Yatsuhashi, N. Nakashima, V. Zhakhovskii, S. Okihara, K. Nishihara, Y. Izawa, F. Sato, S. Sakabe

    Conference on Lasers and Electro-Optics Europe - Technical Digest   160 - 161   2001年

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    掲載種別:研究論文(国際会議プロシーディングス)  

    Analysis of coulomb explosion of benzene in high intensity laser fields was presented. The irradiation intensity from an Ti:sapphire femtosecond laser with a pulse width of 120 fs was obtained. Detection of Cq+ and H+ was obtained in the time-of-flight spectra accompanied by multiple peaks. The explosion for the Coulomb explosion of C60 was successfully reproduced as classical simulations of molecular dynamics.

  • Xylylene Formation from Vibrationally Hot Cyclophane: Specific Dissociation Rate Constants of Strained Molecules

    J. Phys. Chem. A   0 ( 0 )   0   2001年

  • The role of intersystem crossing in the deactivation of the singlet excited aminofluorenones 査読

    L. Biczók, T. Bérces, T. Yatsuhashi, H. Tachibana, H. Inoue

    Physical Chemistry Chemical Physics   3 ( 6 )   980 - 985   2001年( ISSN:1463-9076

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    掲載種別:研究論文(学術雑誌)  

    Solvent and substituent effects on the competition between internal conversion and triplet formation were studied systematically for aminofluorenones and their N-methylated derivatives. Intersystem crossing (ISC) was found to be the dominant process for the singlet excited 1-amino- and 1-methylaminofluorenone in all solvents. The short fluorescence decay time of these compounds does not originate from intramolecular hydrogen bonding induced internal conversion but it is due to the fast triplet formation. Rather slow (kISC ≤ 4.8 × 107 s-1) and solvent insensitive intersystem crossing characterizes the photophysical behavior of 2-, 3- and 4-aminofluorenones but their internal conversion rate strongly increases with solvent polarity. The change of the internal conversion rate constants with molecular structure and solvent can be rationalized in terms of the energy gap law.

    DOI: 10.1039/b009860o

    CiNii Article

  • Photoionization of polychlorinated compounds with an intense femtosecond laser pulse 査読

    Hideo Harada, Seiji Shimizu, Tomoyuki Yatsuhashi, Nobuaki Nakashima, Shuji Sakabe, Yasukazu Izawa

    Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest   2   2001年

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    掲載種別:研究論文(国際会議プロシーディングス)  

    Photoionization of polychlorinated compounds with an intense femtosecond laser pulse was demonstrated. Ti:sapphire laser system was used and the ion species were recorded using a reflectron time-of-flight mass spectrometer. The spectrometer was placed parallel to the electric field of the linearly polarized laser beam. Ions of polychlorinated compounds were detected in a laser intensity region less than 1×1014W cm-2 and the mechanism was explained in terms of non-resonant multiphoton ionization.

  • Large molecules in high-intensity laser fields 査読

    Nobuaki Nakashima, Seiji Shimizu, Tomoyuki Yatsuhashi, Shuji Sakabe, Yasukazu Izawa

    Journal of Photochemistry and Photobiology C: Photochemistry Reviews   1 ( 2 )   131 - 143   2000年12月( ISSN:1389-5567

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    New research fields have opened up that are related to the interactions between molecules and high-intensity optical fields where the laser intensity ranges from 1012-1017 W cm-2. A broad outline of this area will be described from the perspective of products and new techniques for beam generation. Studies of large molecules have begun and some examples are introduced herein. Parent ions with little fragmentation are found to form in the intensity region below 1016 W cm-2. The formation of intact ions can be used in femtosecond laser mass spectrometry. In the intensity region above 1016 Wcm-2, electrons are stripped from the molecules by optical field ionization and the highly charged ions can undergo a Coulomb explosion. Coulomb explosions of benzene and C60 have been demonstrated, and the mechanism can be analyzed by means of molecular dynamics simulations. A high intensity femtosecond laser beam can be converted to radiation sources of coherent VUV light, X-rays etc. and some possibilities for new chemical applications will be discussed. © 2000 Japanese Photochemistry Association. All rights reserved.

    DOI: 10.1016/S1389-5567(00)00009-5

  • Vacuum-UV three-photon chemical reaction via vibrationally hot molecules: Decomposition of triphenylmethane 査読

    Tomoyuki Yatsuhashi, Nobuaki Nakashima

    Journal of Physical Chemistry A   104 ( 46 )   10645 - 10647   2000年11月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    A VUV (vacuum-UV) three-photon hot molecule reaction is demonstrated in this study for gaseous triphenylmethane (TPM). A TPM radical was derived from vibrationally hot TPM, which sequentially absorbed the second and third photons within a laser pulse. In the condensed phase, TPM radical was formed by the deprotonation of a cation radical, which was formed by the two-photon ionization. The multiphoton reaction via a hot molecule is a special case which can produce a neutral radical directly. This study also shows that more than two high-energy photons (VUV) can be absorbed and accumulated as vibrational energy. It should be emphasized that an internal conversion is not a useless photophysical process, but a very interesting process for forming an important intermediate in multiphoton laser chemistry. © 2000 American Chemical Society.

    DOI: 10.1021/jp003017c

    CiNii Article

  • Steady-state and time-resolved fluorescence analysis for a cyanobiphenyl mesogen in polymer-dispersed liquid crystal films

    Shinji Kato, Feng Qi Chen, Tetsuya Shimada, Tomoyuki Yatsuhashi, Haruo Inoue, Chyongjin Pac

    Journal of Physical Chemistry B   104 ( 12 )   2642 - 2646   2000年03月( ISSN:1520-6106

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    Steady-state and time-resolved fluorescence behavior of 4-cyano-4′-pentylbiphenyl (5CB) in polymer-dispersed liquid crystal (PDLC) films sandwiched between two quartz substrates was characterized by the surfacelimited excitation (SLE) and through-film excitation (TFE) methods, which were used to discriminate the emissions from the interface layer with the substrate and from the interior domain. Although PDLC films showed both the monomer and excimer emissions of 5CB, SLE gave a substantially greater contribution of the former in the fluorescence than TFE. By contrast, a neat nematic film of 5CB showed exclusively the excimer emission independently of the excitation methods. Time-resolved analysis of the excimer emission from PDLC films revealed double-exponential decay profiles with shorter-lived (1.5-1.8 ns) and longer-lived (12-17 ns) components, in which the former is dominant for the excimer emission obtained by SLE, while the latter takes a major part for that obtained by TFE. By contrast, the excimer emission from a neat nematic film of 5CB showed a single-exponential decay with a ∼7 ns lifetime independently of the excitation methods. The unique fluorescence behavior of the PDLC films has been discussed in terms of different molecular aggregation features of 5CB in the interface layer and in the interior domain. © 2000 American Chemical Society.

  • Steady-state and time-resolved fluorescence analysis for a cyanobiphenyl mesogen in polymer-dispersed liquid crystal films 査読

    Shinji Kato, Feng Qi Chen, Tetsuya Shimada, Tomoyuki Yatsuhashi, Haruo Inoue, Chyongjin Pac

    Journal of Physical Chemistry B   104 ( 12 )   2642 - 2646   2000年03月( ISSN:1520-6106

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    掲載種別:研究論文(学術雑誌)  

    Steady-state and time-resolved fluorescence behavior of 4-cyano-4′-pentylbiphenyl (5CB) in polymer-dispersed liquid crystal (PDLC) films sandwiched between two quartz substrates was characterized by the surfacelimited excitation (SLE) and through-film excitation (TFE) methods, which were used to discriminate the emissions from the interface layer with the substrate and from the interior domain. Although PDLC films showed both the monomer and excimer emissions of 5CB, SLE gave a substantially greater contribution of the former in the fluorescence than TFE. By contrast, a neat nematic film of 5CB showed exclusively the excimer emission independently of the excitation methods. Time-resolved analysis of the excimer emission from PDLC films revealed double-exponential decay profiles with shorter-lived (1.5-1.8 ns) and longer-lived (12-17 ns) components, in which the former is dominant for the excimer emission obtained by SLE, while the latter takes a major part for that obtained by TFE. By contrast, the excimer emission from a neat nematic film of 5CB showed a single-exponential decay with a ∼7 ns lifetime independently of the excitation methods. The unique fluorescence behavior of the PDLC films has been discussed in terms of different molecular aggregation features of 5CB in the interface layer and in the interior domain. © 2000 American Chemical Society.

  • Hot molecule as an intermediate in multiphoton reaction: Two-photon decarbonylation of coumarin 査読

    Tomoyuki Yatsuhashi, N. Nakashima

    Journal of Physical Chemistry A   104 ( 6 )   1095 - 1099   2000年02月( ISSN:1089-5639

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    掲載種別:研究論文(学術雑誌)  

    The photodecarbonylation of gaseous coumarin was studied using an ArF excimer laser. The triplet state, fluorescence, and cation radical of coumarin were not observed in the transient spectra. The addition of nitrogen effectively quenched the formation of 2,3-benzofuran, indicating that 2,3-benzofuran was derived from the highly vibrationally excited state of coumarin. Transient absorption was proportional to the square of the laser fluence. All of the results showed that the hot coumarin was an intermediate in the two-photon decarbonylation reaction. The decarbonylation reaction of coumarin is the first example of the multiphoton reaction of hot molecules other than hydrocarbons. This new photochemical reaction pathway of coumarin was opened by the hot molecular mechanism. © 2000 American Chemical Society.

    DOI: 10.1021/jp993339k

    CiNii Article

  • Decompoisition of Gaseous Phthalic Anhydride from Vibrationally Hot Molecule Formed by ArF Laser Irradiation

    八ッ橋知幸、中島信昭

    J. Phys. Chem. A   104 ( 2 )   203 - 208   2000年

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    掲載種別:研究論文(学術雑誌)  

  • Decomposition of Gaseous Phthalic Anhydride from a Vibrationally Hot Molecule Formed by ArF Laser Irradiation

    Yatsuhashi T, Nakashima N.

    Journal of Physical Chemistry A   104 ( 2 )   203 - 208   2000年

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  • Decompoisition of Gaseous Phthalic Anhydride from Vibrationally Hot Molecule Formed by ArF Laser Irradiation

    YATSUHASHI Tomoyuki

    J. Phys. Chem. A   104 ( 2 )   203 - 208   2000年( ISSN:1089-5639

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    共著区分:単著  

    DOI: 10.1021/jp992469q

    CiNii Article

  • Steady-State and Time-Resolved Fluorescence Analysis for a Cyanobiphenyl Mesogen in Polymer-Dispersed Liquid Crystal Films

    YATSUHASHI Tomoyuki

    J. Phys. Chem. B   104 ( 12 )   2642 - 2646   2000年( ISSN:1089-5647

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    共著区分:単著  

    DOI: 10.1021/jp993702n

    CiNii Article

  • Hot Molecule as an Intermediate in Multiphoton Reaction: Two-Photon Decarbonylation of Coumarin

    YATSUHASHI Tomoyuki

    J. Phys. Chem. A   104 ( 6 )   1095 - 1099   2000年( ISSN:1089-5639

     詳細を見る

    共著区分:単著  

    DOI: 10.1021/jp993339k

    CiNii Article

  • Vacuum-UV Three-Photon Chemical Reaction via Vibrationally Hot Molecules: Decomposition of Triphenylmethane

    YATSUHASHI Tomoyuki

    J. Phys. Chem. A   104 ( 46 )   10645 - 10647   2000年( ISSN:1089-5639

     詳細を見る

    共著区分:単著  

    DOI: 10.1021/jp003017c

    CiNii Article

  • The Role of Intersystem Crossing in the Deactivation of the Singlet Excited Aminofluorenones

    Biczok, L.; Berces, T.; Yatsuahshi, T.: Tachibana, H.; Inoue, H.

    Phys. Chem. Chem. Phys.   3 ( 6 )   980 - 985   2000年

     詳細を見る

    掲載種別:研究論文(学術雑誌)  

  • Steady-State and Time-Resolved Fluorescence Analysis for a Cyanobiphenyl Mesogen in Polymer-Dispersed Liquid Crystal Films

    加藤愼治、陳鳳啓、嶋田哲也、八ッ橋知幸、井上晴夫、朴鐘震

    J. Phys. Chem. B   104 ( 12 )   2642 - 2646   2000年

     詳細を見る

    掲載種別:研究論文(学術雑誌)  

  • Vacuum-UV Three-Photon Chemical Reaction via Vibrationally Hot Molecules: Decomposition of Triphenylmethane

    Yatsuhashi, T.; Nakashima, N.

    J. Phys. Chem. A   104 ( 46 )   10465 - 10467   2000年

     詳細を見る

    掲載種別:研究論文(学術雑誌)  

  • Hot Molecule as an Intermediate in Multiphoton Reaction: Two-Photon Decarbonylation of Coumarin

    八ッ橋知幸、中島信昭

    J. Phys. Chem. A   104 ( 6 )   1095 - 1099   2000年

     詳細を見る

    掲載種別:研究論文(学術雑誌)  

  • Large Molecules in a High Intensity Laser Field

    YATSUHASHI Tomoyuki

    J. Photochem. Photobiol. C: Photochemistry Reviews   1 ( 2 )   131 - 143   2000年( ISSN:1389-5567

     詳細を見る

    共著区分:単著  

    DOI: 10.1016/S1389-5567(00)00009-5

  • The Role of Intersystem Crossing in the Deactivation of the Singlet Excited Aminofluorenones

    YATSUHASHI Tomoyuki

    Phys. Chem. Chem. Phys.   3 ( 6 )   980 - 985   2000年( ISSN:1463-9076

     詳細を見る

    共著区分:単著  

    DOI: 10.1039/b009860o

    CiNii Article

  • Large molecules in high-intensity laser fields

    Nakashima N, Shimizu S, Yatsuhashi T, Sakabe S, Izawa Y.

    Journal of Photochemistry and Photobiology C: Photochemistry Reviews   1 ( 2 )   131 - 143   2000年

     詳細を見る

  • ダイオキシン類関連の光反応

    八ッ橋 知幸

    光化学   30 ( 2 )   134   1999年

     詳細を見る

    共著区分:単著  

  • Photophysical properties of intramolecular charge-transfer excited singlet state of aminofluorenone derivatives 査読

    Tomoyuki Yatsuhashi, Yuka Nakajima, Tetsuya Shimada, Haruo Inoue

    Journal of Physical Chemistry A   102 ( 18 )   3018 - 3024   1998年04月( ISSN:1089-5639

     詳細を見る

    担当区分:筆頭著者   掲載種別:研究論文(学術雑誌)  

    Photophysical properties of fluorenone and 12 aminofluorenone derivatives were investigated systematically by fluorescence quantum yield and picosecond lifetime measurements in cyclohexane, benzene, acetonitrile, and ethanol. Aminofluorenones underwent efficient deactivation in ethanol, except for the 1-aminofluorenone derivatives. An appreciable deuterium isotope effect on the radiationless deactivation (knr) was observed in all aminofluorenones. The largest effect was observed for 4-aminofluorenone (knr(EtOH)/knr(EtOD) = 1.9), while the smallest was for 1-aminofluorenone (knr(EtOH)/knr(EtOD) = 1.2). The radiationless deactivation in ethanol was concluded to be induced through an intermolecular hydrogen bond between the hydroxyl hydrogen of ethanol and the carbonyl oxygen of aminofluorenones. The possibility of a twisted intramolecular charge-transfer state in the case of 1-(dimethylamino)fluorenone was explored by semiempirical molecular orbital calculation.

    DOI: 10.1021/jp980158u

    CiNii Article

  • Photophysical Properties of Intramolecular Charge-Transfer Excited Singlet State of Aminofluorenone Derivatives

    八ッ橋知幸、中島由香、嶋田哲也、井上晴夫

    J. Phys. Chem. A   102 ( 18 )   3018   1998年

     詳細を見る

    掲載種別:研究論文(学術雑誌)  

  • Molecular Mechanism of RadiatiolessDeactivation from Intramolecular Charge-Transfer Excited Singlet State of Aminofluorenones through Hydrogen Bond with Alcohols

    八ッ橋知幸、中島由香、嶋田哲也、立花宏、井上晴夫

    J. Phys. Chem. A   102 ( 45 )   8657   1998年

     詳細を見る

    掲載種別:研究論文(学術雑誌)  

  • Molecular mechanism for the radiationless deactivation of the intramolecular charge-transfer excited singlet state of aminofluorenones through hydrogen bonds with alcohols

    Yatsuhashi T, Nakajima Y, Shimada T, Tachibana H, Inoue H.

    Journal of Physical Chemistry A   102 ( 45 )   8657 - 8663   1998年

     詳細を見る

  • Photophysical Properties of Intramolecular Charge-Transfer Excited Singlet State of Aminofluorenone Derivatives

    YATSUHASHI Tomoyuki

    J. Phys. Chem. A   102 ( 18 )   3018 - 3024   1998年( ISSN:1089-5639

     詳細を見る

    共著区分:単著  

    DOI: 10.1021/jp980158u

    CiNii Article

  • Molecular Mechanism of Radiatioless Deactivation from Intramolecular Charge-Transfer Excited Singlet State of Aminofluorenones through Hydrogen Bond with Alcohols

    YATSUHASHI Tomoyuki

    J. Phys. Chem. A   102 ( 45 )   8657 - 8663   1998年( ISSN:1089-5639

     詳細を見る

    共著区分:単著  

    DOI: 10.1021/jp981975x

    CiNii Article

  • Molecular mechanism of radiationless deactivation of aminoanthraquinones through intermolecular hydrogen-bonding interaction with alcohols and hydroperoxides 査読

    Tomoyuki Yatsuhashi, Haruo Inoue

    Journal of Physical Chemistry A   101 ( 44 )   8166 - 8173   1997年10月( ISSN:1089-5639

     詳細を見る

    担当区分:筆頭著者   掲載種別:研究論文(学術雑誌)  

    The molecular mechanism of radiationless deactivation from the excited singlet state of aminoanthraquinones (AAQ) induced by alcohols and hydroperoxides was investigated by time-resolved picosecond fluorescence measurements. AAQ suffered substantial fluorescence quenching with red shifts of their λmax in benzene solution upon addition of alcohol and hydroperoxide. Primary alcohols exhibited the largest quenching effects among 26 alcohols examined, while tertiary alcohols were least effective. The Stern-Volmer constants were well correlated with the 13C NMR chemical shift of the carbinol carbon atom and the contact molecular surface area of the hydroxyl hydrogen of the quenchers, while it apparently did not depend upon pKa values. Contact molecular surface area was revealed to be a good quantitative parameter for the steric effect in the intermolecular hydrogen-bonding interaction. The steric factor was dominant in the fluorescence-quenching process, but the electronic factor becomes evident among the molecules having the same steric factor such as benzyl alcohol derivatives, where the Hammet plot showed a good linearity. Fluorescence decay kinetics clearly showed that two emitting levels were involved such as the fluorescent state in benzene and a fully relaxed state in which reorganization of the surrounding alcohol was established. Estimated lifetimes of the fully relaxed states were longer than those in neat alcohol by a factor of 30. The results were interpreted that there were at least two relaxation pathways by alcohol reorganization through the intermolecular hydrogen bond. A specific reorganization of alcohol to AAQ induced relaxation from the fluorescent state in benzene to a relaxed, emissive state and to another relaxed, nonfluorescent state. The latter leads to an efficient radiationless deactivation. The relaxed emissive state corresponds to the excited state of intermolecular hydrogen-bonded species of AAQ with the alcohol in the ground state in which the hydroxyl group of alcohol interacts through an in-plane mode against the carbonyl oxygen of AAQ. Another relaxed nonfluorescent state is formed through an out-of-plane mode interaction between AAQ and the hydroxyl group of alcohol.

    DOI: 10.1021/jp970581n

    CiNii Article

  • Molecular Mechanism of Radiationless Deactivation of Aminoanthraquinones through Intermolecular Hydrogen-Bonding Interaction with Alcohols and Hydroperoxides

    八ッ橋知幸、井上晴夫

    J. Phys. Chem. A   101 ( 44 )   8166   1997年

     詳細を見る

    掲載種別:研究論文(学術雑誌)  

  • Molecular Mechanism of Radiationless Deactivation of Aminoanthraquinones through Intermolecular Hydrogen-Bonding Interaction with Alcohols and Hydroperoxides

    YATSUHASHI Tomoyuki

    J. Phys. Chem. A   101 ( 44 )   8166 - 8173   1997年( ISSN:1089-5639

     詳細を見る

    共著区分:単著  

    DOI: 10.1021/jp970581n

    CiNii Article

▼全件表示

書籍等出版物

  • High-Energy Chemistry and Processing in Liquids

    Ishikawa Y.( 担当: 単著)

    High-Energy Chemistry and Processing in Liquids  2022年01月  ( ISBN:9789811677977

     詳細を見る

    著書種別:学術書  

    DOI: 10.1007/978-981-16-7798-4

    Scopus

  • CSJカレントレビュー 第18号  強光子場の化学

    八ッ橋 知幸( 担当: 単著 ,  範囲: フェムト秒フィラメンテーションに伴う化学反応)

    化学同人  2015年03月 

     詳細を見る

    著書種別:学術書  

  • 光化学の事典

    八ッ橋 知幸( 担当: 単著 ,  範囲: 「レーザーメス」、「レーザー治療」)

    朝倉書店  2014年06月 

     詳細を見る

    著書種別:学術書  

  • レーザーと化学

    八ッ橋 知幸( 担当: 共著)

    共立出版  2012年02月 

     詳細を見る

    著書種別:学術書  

  • 分子発光ー電子的励起状態の描像

    八ッ橋知幸、中島信昭 大阪市立大学大学院理学研究科 基礎教育化学実験グループ 編( 担当: 共著)

    ふくろう出版、基礎化学実験  2006年  ( ISBN:4861862647

     詳細を見る

    著書種別:学術書  

  • Progress in Ultrafast Intense Laser Science II

    Nakashima, N.*, Yatsuhashi, T.( 担当: 分担執筆 ,  範囲: Intact Molecular Ion Formation of Some Organic Molecules by Femtosecond Laesrs)

    Springer  2006年  ( ISBN:3540344217

     詳細を見る

    総ページ数:v.   著書種別:学術書  

    CiNii Books

▼全件表示

MISC(その他記事)

  • Preface 査読

    Ishikawa Y.

    High-Energy Chemistry and Processing in Liquids   v - vi   2022年01月( ISBN:9789811677977

     詳細を見る

    掲載種別:記事・総説・解説・論説等(学術雑誌)  

    DOI: 10.1007/978-981-16-7798-4_Preface

  • 強光子場下における有機分子のイオン化

    八ッ橋知幸、中島信昭

    しょうとつ   5 ( 2 )   5 - 21   2008年

     詳細を見る

    掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • Intact Molecular Ion Formation of Some Organic Molecules by Femtosecond Lasers

    Nakashima, N.; Yatsuhashi, T.

    Springer, Progress in Ultrafast Intense Laser Science   2   25 - 41   2007年( ISBN:3540381538

     詳細を見る

    掲載種別:記事・総説・解説・論説等(その他)  

  • Ionization and Fragmentation of some Organic Molecules with Intense Femtosecond Laser Pulses

    Nakashima, N.; Yatsuhashi, T.; Murakami, M.; Mizoguchi, R.; Shimada, Y.

    World Scientific Pub. Co Inc., Advances in Multiphoton Processses and Spectroscopy   17   179 - 219   2006年( ISBN:9812566465

     詳細を見る

    掲載種別:記事・総説・解説・論説等(その他)  

  • 高強度フェムト秒レーザーと分子の相互作用:イオン化の基礎過程とその応用 ~イオン化波長効果~

    八ッ橋知幸、中島信昭

    光化学   36 ( 1 )   10 - 19   2005年

     詳細を見る

    掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • フェムト秒質量分析法

    中島信昭、八ッ橋知幸、篠原秀則、島田義則

    応用物理   73 ( 2 )   215 - 219   2004年

     詳細を見る

    掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • VUV Laser Chemistry - Formation of Hot Molecules and Their Reactions in the Gas Phase -

    Yatsuhashi, T.; Nakashima, N.

    Bull.Chem.Soc.Jpn.   74 ( 4 )   579 - 593   2001年

     詳細を見る

    掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • Large Molecules in a High Intensity Laser Field

    Nakashima, N.; Shimizu, S.; Yatsuhashi, T.; Sakabe, S.; Izawa, Y.

    J. Photochem. Photobiol. C: Photochemistry Reviews   1 ( 2 )   131 - 143   2000年

     詳細を見る

    掲載種別:記事・総説・解説・論説等(学術雑誌)  

  • ダイオキシン類関連の光反応

    -

    光化学   30 ( 2 )   134   1999年

▼全件表示

講演・口頭発表等

  • (本人発表)多価カチオンの準安定イオン分解測定のための新たな手法 国内会議

    八ッ橋知幸

    新学術領域 高次複合光応答分子システムの開拓と学理の構築 第8回公開シンポジウム  2019年01月 

     詳細を見る

    会議種別:ポスター発表  

  • (本人発表)液中レーザープラズマによる親水性フッ化炭素ナノ粒子の生成 国内会議

    岡本拓也,八ッ橋知幸

    第61回 放射線化学討論会  2018年09月 

     詳細を見る

    会議種別:ポスター発表  

  • (本人発表)First Definitive Identification of Intact Organic Pentacation Radical 国際会議

    Akihiro Kitashoji, Tomoyuki Yatsuhashi

    3rd Workshop on Photo-active materials with Cooperative and Synergetic Responses - Nanosynergetics, International Associated Laboratory (LIA) between France and Japan  2018年05月 

     詳細を見る

    会議種別:ポスター発表  

  • (本人発表) 多光子励起による有機金属錯体のナノ粒子化 国内会議

    岡本拓也、八ッ橋知幸、木原諒、、朝日剛

    新学術領域「高次複合光応答分子システムの開拓と学理の構築」 平成29年度第6回公開シンポジウム  2018年01月 

     詳細を見る

    会議種別:ポスター発表  

  • (本人発表)液中レーザープラズマによる有機・有機金属ナノ粒子生成高強度レーザによる新規化学反応の開拓 液相への展開 国内会議

    八ッ橋知幸

    第3回さきがけ発展研究会  2017年11月 

     詳細を見る

    会議種別:口頭発表(一般)  

  • (本人発表)液中レーザープラズマによる有機・有機金属ナノ粒子生成 国内会議

    岡本拓也、中村貴宏、朝日剛、迫田憲治、八ッ橋知幸

    「新領域研究グループ 液相高エネルギー化学の新展開研究会・電気学会・電子材料研究会 -物質生成・材料合成を目指した高エネルギープロセス-  2017年09月 

     詳細を見る

    会議種別:口頭発表(一般)  

  • (本人発表)多重イオン化による芳香族多価分子カチオンの生成とその反応追跡 国内会議

    八ッ橋知幸

    新学術領域「高次複合光応答分子システムの開拓と学理の構築」 平成29年度第2回領域会議  2017年05月 

     詳細を見る

    会議種別:ポスター発表  

▼全件表示

産業財産権等

科研費

  • 微小液滴を反応場とする単一ナノメートル合金粒子の高効率合成と光学・磁気特性の探索

    2023年

  • トップダウン・ボトムアップレーザープロセスによるハイエントロピー合金ナノ粒子創製

    2022年

  • 微小液滴を反応場とする単一ナノメートル合金粒子の高効率合成と光学・磁気特性の探索

    2022年

担当教育概要

  • 基幹物理化学(2単位・分担),創成分子科学演習(8単位・担当),前期特別研究(12単位・担当),創成分子科学ゼミナール(2単位・担当),後期特別研究(8単位・担当),化学産業論(2単位・世話役), 基礎化学実験II(3単位・分担),大阪の知(2単位・ファシリテーター2件), 分子分光学(2単位・担当)、化学実験II(3単位・分担)、特別研究(10単位・担当)、化学実験S(3単位・分担)

担当授業科目

  • 基礎化学実験II

    2017年度     大学

  • 特別研究

    2017年度     大学

  • 化学実験II

    2017年度     大学

  • 分子分光学

    2017年度     大学

  • 後期特別研究

    2017年度     大学院

  • 創成分子科学ゼミナール

    2017年度     大学院

  • 前期特別研究

    2017年度     大学院

  • 創成分子科学演習

    2017年度     大学院

  • 基幹物理化学

    2017年度     大学院

  • 基礎化学実験II

    1900年度     大学

▼全件表示

学外での担当授業科目

  • 物理化学1

    機関名:大阪市立大学

  • 大阪市大インターネット講座

    機関名:大阪市立大学

  • 基礎物理化学B

    機関名:大阪市立大学

  • 基礎化学実験II

    機関名:大阪市立大学

  • 基幹物理化学

    機関名:大阪市立大学

  • 反応速度論

    機関名:大阪市立大学

  • 化学概論

    機関名:大阪市立大学

  • 化学実験II

    機関名:大阪市立大学

  • 化学セミナー2

    機関名:大阪市立大学

  • 化学セミナー1

    機関名:大阪市立大学

  • 化学セミナー

    機関名:大阪市立大学

  • 分子物理化学特論III

    機関名:大阪市立大学

  • 分子分光学

    機関名:大阪市立大学

  • レーザー化学特論

    機関名:大阪市立大学

▼全件表示

社会貢献活動

  • 高大連携講座(大阪府立泉北高等学校)「仕事と熱、熱と仕事」

    役割:講師

    2017年06月

  • 高大連携講座(大阪府立泉北高等学校) 「熱と温度」

    役割:講師

    2015年06月

  • 数学や理科の好きな高校生のための市大授業 「仕事と熱、熱と仕事」

    役割:講師

    2011年04月

  • 模擬授業(大阪府立岸和田高等学校)「熱と温度」

    役割:講師

    2010年07月

  • 2008年度 大阪市立大学 化学セミナー 「この化学反応は起こるのか?」

    役割:講師

    2008年08月

メディア報道

  • 「炭素微粒子にフッ素導入 レーザー照射で簡便に 大阪市立大学など」

    化學工業日報  2016年09月

  • Osaka researchers use laser to measure dioxin concentration

    THE DAILY YOMIURI  2005年08月

  • 環境汚染物質の濃度、レーザーでスピード測定

    読売新聞  2005年08月

役職

  • 部局内役職

    大学院理学研究科 化学専攻 

    専攻長  2023年04月 - 2024年03月

  • 部局内役職

    理学部 化学科 

    学科長  2023年04月 - 2024年03月

その他

  • 職務経歴

    2008年

      詳細を見る

    大阪市立大学 准教授

  • 職務経歴

    2002年

      詳細を見る

    大阪市立大学 講師

  • 職務経歴

    1998年

      詳細を見る

    大阪市立大学 助手