Updated on 2024/12/21

写真a

 
Kohsuke Suma
 
Organization
Research Field in Education, Law, Economics and the Humanities Area Faculty of Education Teacher Education Course (Science Education) Associate Professor
Title
Associate Professor

Degree

  • 博士（学術） ( 2006.3   東京大学 )

Research Interests

  • 高分解能分光

  • 高分解能分光

  • ラジカル

  • 不安定分子

  • 星間化学

  • 分子分光学

  • 物理化学

  • キャビティーリングダウン分光

  • フリーラジカル

  • ラジカル錯体

  • ラジカル

Research Areas

  • Nanotechnology/Materials / Fundamental physical chemistry

Education

  • The University of Tokyo

    - 2007.3

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    Country： Japan

  • The University of Tokyo   College of Arts and Sciences   Department of Basic Science

    1997 - 2001

Research History

  • Kagoshima University   Research Field in Education, Law, Economics and the Humanities Area Faculty of Education Teacher Education Course (Science Education)   Associate Professor

    2011.4

  • The University of Tokyo   Graduate School of Arts and Sciences

    2010.12 - 2011.3

  • 東京大学 工学(系)研究科(研究院)   助教

    2008 - 2010

  • 日本学術振興会 特別研究員（ＰＤ）

    2006.4 - 2008.12

Professional Memberships

  • THE CHEMICAL SOCIETY OF JAPAN

  • THE SPECTROSCOPICAL SOCIETY OF JAPAN

  • JAPAN SOCIETY FOR MOLECULAR SCIENCE

Committee Memberships

  • 日本分光学会   代議員  

    2024.4   

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    Committee type：Academic society

  • 日本化学会   九州支部幹事  

    2017.4 - 2018.3   

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    Committee type：Academic society

 

Papers

  • Kohsuke Suma, Yoshihiro Sumiyoshi, and Yasuki Endo .  Force-field calculation and geometry of the HOOO radical .  THE JOURNAL OF CHEMICAL PHYSICS139 ( 9 ) 94301   2013.9Force-field calculation and geometry of the HOOO radicalReviewed

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    Language：English   Publishing type：Research paper (scientific journal)  

  • Akira Matsugi, Kohsuke Suma, Akira Miyosh .  Kinetics and Mechanisms of the Allyl + Allyl and Allyl + Propargyl Recombination Reactions .  The Journal of Physical Chemistry A115 ( 26 ) 7610 - 7624   2011.5Kinetics and Mechanisms of the Allyl + Allyl and Allyl + Propargyl Recombination ReactionsReviewed

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    Language：English   Publishing type：Research paper (scientific journal)  

  • Akira Matsugi, Kohsuke Suma, Akira Miyoshi .  Deuterium kinetic isotope effects on the gas-phase reactions of C2H with H2(D2) and CH4(CD4) .  Physical Chemistry Chemical Physics13   4022 - 4031   2011.1Deuterium kinetic isotope effects on the gas-phase reactions of C2H with H2(D2) and CH4(CD4)Reviewed

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    Language：English   Publishing type：Research paper (scientific journal)  

  • Tetsuya Mori, Kohsuke Suma, Yoshihiro Sumiyoshi, Yasuki Endo .  Spectroscopic detection of the most stable carbonic acid, cis-cis H2CO3 .  Journal of Chemical Physics134   44319 - 44325   2011.1Spectroscopic detection of the most stable carbonic acid, cis-cis H2CO3Reviewed

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    Language：English   Publishing type：Research paper (scientific journal)  

  • Akira Matsugi, Kohsuke Suma, Akira Miyoshi .  Rate Constants and Kinetic Isotope Effects on the Reaction of C-2((XEg+)-E-1) with CH4 and CD4 .  JOURNAL OF PHYSICAL CHEMISTRY A114 ( 13 ) 4580 - 4585   2010.4Rate Constants and Kinetic Isotope Effects on the Reaction of C-2((XEg+)-E-1) with CH4 and CD4Reviewed

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER CHEMICAL SOC  

    Rate constants and kinetic isotope effect (KIE) for the reaction of singlet dicarbon, C-2(X-1 Sigma(+)(g)), with CH4 and CD4 have been measured over the temperature range 294-376 K by using the pulsed laser photolysis/laser-induced fluorescence technique. C-2(X-1 Sigma(+)(g)) were generated by multiphoton laser decomposition of C2Cl4 at 248 nm and its decay trace was monitored on the (0,0) band of the Mulliken system at 231.2 nm. Measured rate constants showed slightly positive temperature dependence, whereas the KIE [= k(CH4)/k(CD4)] was almost independent of temperature and the value of which was 2.1 +/- 0.2 as a simple average of the values of KIE at different temperatures. Quantum chemical calculation with CASPT2 method indicated that the reaction proceeds via a direct hydrogen abstraction mechanism to form C2H and CH3 radicals. Variational transition-state theory calculations were performed employing a dual-level method. Anharmonic effects along transitional modes were included in the calculation, and a comparison of the rate constants with and without anharmonic corrections demonstrated the importance of anharmonicity. The calculated rate constants and KIE showed good agreement with the experiments except for the temperature dependence of the KIE. A possible cause of the discrepancy was discussed in terms of the long-range interaction between the reactants.

    DOI： 10.1021/jp1012494

    Web of Science

    PubMed

  • Akira Matsugi, Kohsuke Suma, Akira Miyoshi .  Rate constants and kinetic isotope effects on the reaction of C2(X1Σg+) with CH4 and CD4 .  The Journal of Physical Chemistry A114 ( 13 ) 4580 - 4585   2010.1Rate constants and kinetic isotope effects on the reaction of C2(X1Σg+) with CH4 and CD4Reviewed

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    Language：Japanese   Publishing type：Research paper (scientific journal)  

  • Tetsuya Mori, Kohsuke Suma, Yoshihiro Sumiyoshi, Yasuki Endo .  Spectroscopic detection of isolated carbonic acid .  Journal of Chemical Physics130   204308 - 204314   2009.5Spectroscopic detection of isolated carbonic acidReviewed

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    Language：English   Publishing type：Research paper (scientific journal)  

  • 須磨 航介 .  酸素を含むラジカル、ラジカル錯体のマイクロ波分光 .  分光研究55 ( 3 ) 182 - 190   2006.6酸素を含むラジカル、ラジカル錯体のマイクロ波分光Reviewed

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    Language：Japanese   Publishing type：Research paper (scientific journal)  

  • Kohsuke Suma, Yoshihiro Sumiyoshi, Yasuki Endo .  The rotational spectrum of the water-hydroperoxy radical (H2O-HO2) complex .  Science311 ( 5765 ) 1278 - 1281   2006.3The rotational spectrum of the water-hydroperoxy radical (H2O-HO2) complexReviewed

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    Language：English   Publishing type：Research paper (scientific journal)  

  • Kohsuke Suma, Yoshihiro Sumiyoshi, Yasuki Endo .  The rotational spectrum and structure of HOOOH .  Journal of the American Chemical Society127   14998 - 14999   2005.11The rotational spectrum and structure of HOOOHReviewed

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    Language：English   Publishing type：Research paper (scientific journal)  

  • Y Sumiyoshi, H Katsunuma, K Suma, Y Endo .  Spectroscopy of Ar-SH and Ar-SD. I. Observation of rotation-vibration transitions of a van der Waals mode by double-resonance spectroscopy .  JOURNAL OF CHEMICAL PHYSICS123 ( 5 ) 054324   2005.8

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER INST PHYSICS  

    Rotation-vibration transitions of a van der Waals bending vibration, P=1/2 <- 3/2, of the Ar-SH/SD (X (2)Pi) complexes in the electronic ground state have been observed by applying newly developed microwave-millimeter-wave double-resonance spectroscopy. The rotational energy-level structure for the two isotopomers, with hyperfine structure due to the hydrogen or deuterium nuclei and parity doublings in the P=1/2 state, has now been clarified. Detailed explanation of the double-resonance technique is also given. (C) 2005 American Institute of Physics.

    DOI： 10.1063/1.1943967

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  • Yoshihiro Sumiyoshi, Hajime Katsunuma, Kohsuke Suma, Yasuki Endo .  Spectroscopy of Ar-SH and Ar-SD I: Observation of rotation-vibration transitions of a vdW mode by double-resonance spectroscopy .  Journal of Chemical Physics123   54324 - 54330   2005.8Spectroscopy of Ar-SH and Ar-SD I: Observation of rotation-vibration transitions of a vdW mode by double-resonance spectroscopyReviewed

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    Language：English   Publishing type：Research paper (scientific journal)  

  • Kohsuke Suma, Yoshihiro Sumiyoshi, Yasuki Endo .  Spectroscopic characterization of a molecule with a weak bond: the BrOO radical, .  Journal of Chemical Physics123   24312 - 24317   2005.7Spectroscopic characterization of a molecule with a weak bond: the BrOO radical, Reviewed

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    Language：English   Publishing type：Research paper (scientific journal)  

  • K Suma, Y Sumiyoshi, Y Endo .  Spectroscopic characterization of a molecule with a weak bond: The BrOO radical .  JOURNAL OF CHEMICAL PHYSICS123 ( 2 ) 24312   2005.7Spectroscopic characterization of a molecule with a weak bond: The BrOO radicalReviewed

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER INST PHYSICS  

    Pure rotational spectra of the BrOO radical for the Br-79 and Br-81 isotopomers have been observed using a Fourier transform microwave spectrometer. The radical was produced in a supersonic jet by discharging a mixture gas containing bromine and oxygen diluted in argon. A-type rotational transitions are observed for N-'=1-5, K-a=0 with spin doublings and hyperfine splittings due to the nuclear spin of the bromine atom. High-level ab initio calculations by RCCSD(T) and MRCI have also been performed, and results are compared with the experimental data. Molecular structure of BrOO has been discussed based on the present experimental data, supplemented by the tendency among the halogen peroxide series and the results of the ab initio calculations; the Br-O bond is found to be anomalously long and weak. Systematic comparisons with other halogen peroxides have revealed anomalous nature of the X-O (X=halogen atom) bonds for this series of radicals. (c) 2005 American Institute of Physics.

    DOI： 10.1063/1.1953508

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    PubMed

  • K. Suma, Y. Sumiyoshi, and Y. Endo .  The rotational spectrum and structure of the HOOO radical .  Science308 ( 5730 ) 1885   2005.6The rotational spectrum and structure of the HOOO radicalReviewed

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    Language：English   Publishing type：Research paper (scientific journal)  

  • Kohsuke Suma, Wataru Funato, Yoshihiro Sumiyoshi, Yasuki Endo .  Microwave and millimeter wave spectroscopy of the open-shell van der Waals complex Ar-HO2 .  Journal of Chemical Physics122   184302 - 184307   2005.5Microwave and millimeter wave spectroscopy of the open-shell van der Waals complex Ar-HO2Reviewed

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    Language：English   Publishing type：Research paper (scientific journal)  

  • K Suma, Y Sumiyoshi, Y Endo .  Fourier transform microwave spectroscopy and Fourier transform microwave-millimeter wave double resonance spectroscopy of the ClOO radical .  JOURNAL OF CHEMICAL PHYSICS121 ( 17 ) 8351 - 8359   2004.11

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER INST PHYSICS  

    Pure rotational spectra of the ClOO radical for the Cl-35 and Cl-37 isotopomers have been observed using Fourier transform microwave and Fourier transform microwave-millimeter wave double resonance spectroscopy. The rotational, centrifugal, spin-rotation coupling, and hyperfine coupling constants have been determined by least-squares fits of the observed transition frequencies. The molecular constants indicate that the electronic ground state is (2)A". The r(0) structure is determined to be r(0)(ClO)=2.075 Angstrom, r(0)(OO)=1.227 Angstrom, and theta(0)(ClOO)=116.4degrees. Several highly accurate ab initio calculations have also been performed. Some of them turned out to be inaccurate because it is necessary to take into account both static and dynamic electronic correlations. Only multireference (single and double) configuration interaction calculations with large basis sets reproduce the present experimental results. The anharmonic force constants obtained by the ab initio calculations are used to determine the r(e) structure, r(e)(ClO)=2.084(1) Angstrom, r(e)(OO)=1.206(2) Angstrom, and theta(e)(ClOO)=115.4(1)degrees. Unique features of the ClOO radical have become clear by the present experiment and the ab initio calculations. (C) 2004 American Institute of Physics.

    DOI： 10.1063/1.1792591

    Web of Science

    PubMed

  • Kohsuke Suma, Yoshihiro Sumiyoshi, Yasuki Endo .  Fourier transform microwave spectroscopy and FTMW-millimeter wave double resonance spectroscopy of the ClOO radical .  Journal of Chemical Physics121   8351 - 8359   2004.11Fourier transform microwave spectroscopy and FTMW-millimeter wave double resonance spectroscopy of the ClOO radicalReviewed

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    Language：English   Publishing type：Research paper (scientific journal)  

  • Kohsuke Suma, Yoshihiro Sumiyoshi, Yasuki Endo, Shinichi Enami, Simone Aloisio, Satoshi Hashimoto, Masahiro Kawasaki, Satoshi Nishida, Yutaka Matsumi .  Equilibrium Constants of the Reaction of Cl with O2 in the Formation of ClOO .  The Journal of Physical Chemistry A108   8096 - 8099   2004.9Equilibrium Constants of the Reaction of Cl with O2 in the Formation of ClOOReviewed

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  • K Suma, Y Sumiyoshi, Y Endo .  Fourier transform microwave spectroscopy of the Rg-SH((2)Pi(i)) complexes (Rg : Ne, Kr): Determination of the intermolecular potential energy surfaces .  JOURNAL OF CHEMICAL PHYSICS120 ( 15 ) 6935 - 6943   2004.4

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：AMER INST PHYSICS  

    Pure rotational spectra of Ne-SH and Kr-SH have been studied by Fourier transform microwave spectroscopy. R-branch transitions in the lower-spin component (Omega=3/2) corresponding to a linear (2)Pi(i) radical were observed for J"=1.5-4.5 in the region 11-25 GHz for Ne-SH and for J"=1.5-6.5 in the region 5-20 GHz for Kr-SH, respectively, with parity doublings and hyperfine splittings associated with the H nucleus. Although the spectral pattern of Kr-SH is relatively regular, that of Ne-SH is irregular with the J dependence of the parity doublings quite different from other Rg-SH or Ar-OH complexes. Two-dimensional intermolecular potential energy surfaces (IPSs) for both of the species have been determined from the least-squares fittings of the observed rotational transitions utilizing results of high-level ab initio calculations. These IPSs reproduce the observed transition frequencies within the experimental error and provide accurate knowledge on the intermolecular interaction and internal dynamics. Systematic comparisons of Rg-SH complexes have clarified various features of this series of complexes. (C) 2004 American Institute of Physics.

    DOI： 10.1063/1.1669384

    Web of Science

    PubMed

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Presentations

  • 須磨航介   当研究室にお当研究室におけるPDN-CRDSの現状と課題  

    CRDSユーザーズミーティング 

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    Event date： 2019.12

    Language：Japanese   Presentation type：Oral presentation (general)  

    Venue：東京理科大学  

  • Kohsuke Suma, Yoshihiro Sumiyoshi, and Yasuki Endo   Force-field calculation and geometry of the HOOO radical   International conference

    先端分子分光シンポジウム 

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    Event date： 2015.7

    Language：English   Presentation type：Poster presentation  

    Venue：東京大学駒場Iキャンパス  

Awards

  • 日本分光学会賞（奨励賞）

    2008   社団法人 日本分光学会   酸素を含むラジカル、ラジカル錯体 のマイクロ波分光

    須磨航介

  • 東京大学総長賞

    2006   東京大学  

    須磨航介

Research Projects

  • 模擬星間塵有機物のキャビティー分光による星間未同定吸収線の解明

    Grant number：21K18663  2021.7 - 2022.3

    日本学術振興会  科学研究費助成事業  挑戦的研究(萌芽)

    荒木 光典, 須磨 航介

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    Grant amount：\6370000 （ Direct Cost: \4900000 、 Indirect Cost：\1470000 ）

    宇宙の未同定吸収線を同定するため、下記の分光実験及び分光装置開発を行った。
    ①酢酸メチル及び酢酸エチルの高次倍音測定：キャビティー増幅吸収分光装置において、光学フィルタによる迷光除去の手法を開発し、感度を向上することに成功した。それにより、酢酸メチル及び酢酸エチルにおけるCH伸縮の第3-5倍音を初めて検出することができた。この感度を活用して、放電生成物の測定も可能になった。（Chem. Phys. Lett.受理）
    ②ハロゲン化シアンカチオンの電子遷移測定：キャビティーリングダウン（CRD）分光装置を用いて、ハロゲン化シアンカチオンの一つであるICN+のスペクトルを測定した。解析の結果、電子遷移波長と回転定数を精密に決定することに成功した。また、量子化学計算を用いて、星間物質として予想されるClCN+の回転定数を予測した。これら二つの情報から、ClCN+が宇宙で吸収線を生成した時のプロファイルを予測した。その結果、天文観測におけるClCN+の検出が可能になった。（J. Mol. Spec. 審査中）
    ③ CCPラジカルの電子遷移探査：CCPラジカルはリンを含む最も基礎的な炭素鎖ラジカルである。高精度の量子化学計算を行った結果、低い電子励起状態として2Δiのほかに2Σ-、2Σ+の2状態があり、いずれも十分な遷移強度を持ち、先述のLIFによる探査領域にも強い吸収を持つ可能性が高いことがわかった。これらの2状態についてCRD分光による探査を行った。
    ④ 探査可能波長域の拡張：所有しているCRD分光器の探査領域が近赤外から可視光領域に限られていたため、スペクトル探査の対象となり得る分子種や状態に大幅な制限があった。本年度研究により紫外域まで探査可能波長域の拡張を行った。これを用い、紫外域で非蛍光性のラジカルおよびラジカル分子錯体の電子遷移の観測を試みた。

  • キャビティーリングダウンを用いた新規ラジカル分子錯体の分光検出

    2014.4 - 2017.3

    科学研究費補助金  基盤研究(C)

  • 新型放電ノズルによる新規不安定分子種の検出とその内部運動ダイナミクスの探求 研究課題

    2012.4 - 2015.3

    科学研究費補助金  若手研究(B)

  • 放電後混合型スリットノズルを組み合わせたCRDSによる新規不安定分子種の検出 研究課題

    2010.4 - 2012.3

    科学研究費補助金  若手研究(B)

  • 放電後混合型スリットノズルによる不安定分子の生成と高感度検出 研究課題

    2008.4 - 2010.3

    科学研究費補助金  研究活動スタート支援

  • 酸素鎖分子の化学 研究課題

    2006.4 - 2008.3

    科学研究費補助金  特別研究員奨励費

  • ラジカル分子錯体の分子間相互作用の分光学的研究 研究課題

    2004.4 - 2006.3

    科学研究費補助金  特別研究員奨励費

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