1995 Fiscal Year Annual Research Report

フリーラジカルの生成と構造

Research Project

Project/Area Number	05237101
Research Institution	Tokyo Institute of Technology
Principal Investigator	籏野嘉彦東京工業大学, 理学部, 教授 (90016121)
Co-Investigator(Kenkyū-buntansha)	本間健二姫路工業大学, 理学部, 助教授 (30150288) 江播孝之東北大学, 理学部, 助教授 (70142924) 遠藤泰樹東京大学, 教養学部, 助教授 (40106159)
Keywords	極紫外放射光解離 / コインシデンス電子エネルギー損失分光 / フーリエ変換マイクロ波分光 / レーザー二重共鳴法 / RFイオントラップ分光 / クラスターの光解離 / 衝突配向した分子反応 / 超音速ビーム
Research Abstract	本研究では、フリーラジカルの生成メカニズムと構造を研究する上で、もっとも基礎的でかつその解明が急がれている以下の1)〜3)に焦点をあてて研究を行った。 1)分子の光吸収により生成する励起分子の解離過程(シンクロトロン放射光とレーザーを相補的に用いる) 2)電子・分子衝突(放電も含む)によって生成する励起分子の解離過程(パルス放電ノズルを用いる) 3)原子またはフリーラジカルと分子との反応(クラスタービームを用いる) これらを反応ダイナミックスの観点から調べること、また、同時にラジカルの構造を新しい高分解能レーザー分光法により明らかにし、分子定数を精密に決定することを目的とした。籏野は、超励起分子解離ダイナミックスを研究する新しい方法論を開発した。放射光と2次元分光とを組み合わせたものである。また、光学的禁制状態に対しては低エネルギー電子線散乱による電子エネルギー損失スペクトルと解離過程の同時計数測定を開発し新たな知見を得た。本間は、構造を規定した中間体からの半反応を用いて反応の動力学的な情報を得る目的で、H+H_2S+H_2+SH反応系について測定を行いH_2(V,J)分布を明らかにした。江播は、CORydberg状態に対して複数の波長可変・レーザー光による多重共鳴分光法を用いて、主量子数が5以上のリュードベリ状態の回転構造を明らかにした。また、解離フラグメントの生成収率スペクトルを求めた。遠藤は、炭素鎖フリーラジカル、金属原子を含むフリーラジカル、ラジカル錯体等の高分解能分光を行い、多くの新しい知見を得ている。たとえば、OH-H_2O錯体に関するものは、多原子分子錯体の最初の例として興味深い。このようにしてフリーラジカルの生成メカニズムと構造について研究計画調書に記した計画を実施し、成果をあげることが出来た。

Research Products
(31 results)

All Other

All Publications (31 results)

[Publications] Masatoshi UKAI: "State-to-State Behavior in the Neutral Dissociation of O_2 far beyond the Ionization Theshold" Physical Review Letters. 74. 239-242 (1995)
[Publications] Masashi KITAJIMA: "Coincidence Measuremnets of theDissociative Photoionization Excitationof N_2" Jounal of Physics B: At. Mol. Opt. Phys.28. L185-L190 (1995)
[Publications] Masashi KITAJIMA: "One-Electron and Multi-ElectronTransitions observed in the ExcitationFunction of the Dissociative Photoionization Excitation of N_2" Jounal of Physics B: At. Mol. Opt. Phys.(in press).
[Publications] Arno EHRESSMANN: "Threshold Behaviour of Neutral Photodissociation with Excitation of CO Probedby Dispersed Fragment VUV Fluorescence" Jounal of Physics B: At. Mol. Opt. Phys.(in press).
[Publications] Kosei KAMETA: "“Photoabsorption, Photoionization, and Neutral-Dissociation Cross Sections of C_2H_6 and C_3H_8 in the Extreme-UV Range" Journal of Electron Spectroscopy and Related Phenomena. (in press).
[Publications] Arno EHRESMANN: "Neutral Photodissociation of CO into Excited Fragments Investigated by Dispered Fluorescence Spectroscopy" Journal of Electron Spectroscopy and Related Phenomena. (in press).
[Publications] Masashi KITAJIMA: "Excitation Function Measurements of the Dissociative Photoionization Excitation of N_2" Journal of Electron Spectroscopy and Related Phenomena. (in press).
[Publications] Shuntaro MACHIDA: "Neutral Dissociation of N_2O in Superexcited States" Journal of Electron Spectroscopy and Related Phenomena. (in press).
[Publications] Masatoshi UKAI: "Dissociative Photoionization of O_2 in the VUV Region Studied by Photoion Kinetic Energy Spectroscopy" Journal of Electron Spectroscopy and Related Phenomena. (in press).
[Publications] Takeshi ODAGIRI: "Electron Energy-Loss Study of Superexcited Hydrogen Molecules with the Coincidence Detection of the Neutral Dissociation" Jounal of Physics B: At. Mol. Opt. Phys.28. L465-470 (1995)
[Publications] Kenji ITO: "A High-Flux 3-M Normal Incidence Monochromator at Beamline 20A of the Photon Factory" Review of Scientific Instruments. 66. 2119-2121 (1995)
[Publications] Masaaki Komatsu: "Rotational structure and dissociation of the Rydberg states of CO investigated by ion-dip spectroscopy" Journal of Chemical Physics. 103. 2420- (1995)
[Publications] Takayuki Ebata: "Predissociation of Rydberg states of CO investigated by the detection of the C(3P)fragment" Chemical Physics Letters. 241. 357-361 (1995)
[Publications] Akihiro Okazaki: "Degenerate four-wave mixing spectroscopy of jet-cooled SO_2 via the C-Xtransition" Chemical Physics Letters. 241. 275-280 (1995)
[Publications] T. Sekiguchi: "Ion desorption from H_2O chemisorbed on Si(100)by O 1s electron excitation at room temperature" Journal of Chemical Physics. 102. 1422-1431 (1995)
[Publications] Kenji Honma: "The importance of electron transfer mechanism in reaction of neutral transition metal atoms" Laser Chemistry. 15. 209-220 (1995)
[Publications] Kenji Honma: "Kinetics of depletion of electronically excited Ti atom by CH_4, C_2H_2, C_2H_4, and C_2H_6" Journal of Chinese Chemical Society. 42. 371-379 (1995)
[Publications] T.Ibuki: "Radiative dissociation of superexcited C_2H_2, C_2HD, and C_2D_2 at 50-90nm region" Journal of Chemical Physics. 102. 5301-5308 (1995)
[Publications] Kenji Honma: "Laser-initiated half reaction study of H+O_2…>OH(v,J)+O" Journal of Chemical Physics. 102. 7856-7863 (1995)
[Publications] Yukito Naitoh: "Vector correlations in 193nm Photodissociation of the NO dimer" Journal of Chemical Physics. 99. 13652-13658 (1995)
[Publications] K.Senba: "Kinetics of Ti(a^3F, a^5F)and V(a^4F, a^6D)depletion by simple hydrocarbons" Journal of Chemical Physics. 99. 13992-13999 (1995)
[Publications] R.Matsui: "Kinetics of Depletion of Co(b^4F)and Co(a^2F)atoms by O_2" Chemical Physics Letters. (in press).
[Publications] Y.Endo: "PDN-FTMW spectroscopy of Open Shell Complexes" J. C. S. Faraday Discuss.97. 341-350 (1994)
[Publications] H.Kohguchi: "Pulsed-discharge nozzle Fourier-transform microwave spectroscopy of the HC_4O radical" Journal of Chemical Physics. 101. 6463-6469 (1994)
[Publications] Y.Ohshima: "Fourier-transform microwave spectroscopy of triplet carbon monoxides, C_2O, C_4O, C_6O, and C_8O" Journal of Chemical Physics. 102. 1493-1500 (1995)
[Publications] T.Ogata: "Rotational spectra and structures of carbon monoxides, C_5O, C_7O, and C_9O" J. Am. Chem. Soc.117. 3593-3598 (1995)
[Publications] Y.Kasai: "Pure rotational spectrum of FeCO" Journal of Chemical Physics. 103. 90-95 (1995)
[Publications] K.Yamanouchi: "Laser induced fluorescence spectroscopy of the C^1B_2-X^nA_1 band of jetcooled SO_2: rotational and vibrational analysis in the 235-210nm region" J. Mol. Struct.352/353. 541-559 (1995)
[Publications] Y.Ohshima: "Fourier-transform microwave spectroscopy of CCN(X^2П1/2)" J. Mol. Spectrosc.172. 225-232 (1995)
[Publications] Y.Kawashima: "Observation of the Fourier transform microwave transitions of NaBH_4 and KBH_4" J. Mol. Spectrosc.279-289 (1995)
[Publications] Yoshihiko HATANO: "“Photoabsorption, Photoionization, and Photodissociation Cross Sections" in “Atomic and Molecular Data for Radiotherapy" (edited by M.Inokuti)Chapter V" IAEA, (1995)

1995 Fiscal Year Annual Research Report

フリーラジカルの生成と構造

Principal Investigator

籏野 嘉彦 東京工業大学, 理学部, 教授 (90016121)

Research Products

[Publications] Masatoshi UKAI: "State-to-State Behavior in the Neutral Dissociation of O_2 far beyond the Ionization Theshold" Physical Review Letters. 74. 239-242 (1995)

[Publications] Masashi KITAJIMA: "Coincidence Measuremnets of theDissociative Photoionization Excitationof N_2" Jounal of Physics B: At. Mol. Opt. Phys.28. L185-L190 (1995)

[Publications] Masashi KITAJIMA: "One-Electron and Multi-ElectronTransitions observed in the ExcitationFunction of the Dissociative Photoionization Excitation of N_2" Jounal of Physics B: At. Mol. Opt. Phys.(in press).

[Publications] Arno EHRESSMANN: "Threshold Behaviour of Neutral Photodissociation with Excitation of CO Probedby Dispersed Fragment VUV Fluorescence" Jounal of Physics B: At. Mol. Opt. Phys.(in press).

[Publications] Kosei KAMETA: "“Photoabsorption, Photoionization, and Neutral-Dissociation Cross Sections of C_2H_6 and C_3H_8 in the Extreme-UV Range" Journal of Electron Spectroscopy and Related Phenomena. (in press).

[Publications] Arno EHRESMANN: "Neutral Photodissociation of CO into Excited Fragments Investigated by Dispered Fluorescence Spectroscopy" Journal of Electron Spectroscopy and Related Phenomena. (in press).

[Publications] Masashi KITAJIMA: "Excitation Function Measurements of the Dissociative Photoionization Excitation of N_2" Journal of Electron Spectroscopy and Related Phenomena. (in press).

[Publications] Shuntaro MACHIDA: "Neutral Dissociation of N_2O in Superexcited States" Journal of Electron Spectroscopy and Related Phenomena. (in press).

[Publications] Masatoshi UKAI: "Dissociative Photoionization of O_2 in the VUV Region Studied by Photoion Kinetic Energy Spectroscopy" Journal of Electron Spectroscopy and Related Phenomena. (in press).

[Publications] Takeshi ODAGIRI: "Electron Energy-Loss Study of Superexcited Hydrogen Molecules with the Coincidence Detection of the Neutral Dissociation" Jounal of Physics B: At. Mol. Opt. Phys.28. L465-470 (1995)

[Publications] Kenji ITO: "A High-Flux 3-M Normal Incidence Monochromator at Beamline 20A of the Photon Factory" Review of Scientific Instruments. 66. 2119-2121 (1995)

[Publications] Masaaki Komatsu: "Rotational structure and dissociation of the Rydberg states of CO investigated by ion-dip spectroscopy" Journal of Chemical Physics. 103. 2420- (1995)

[Publications] Takayuki Ebata: "Predissociation of Rydberg states of CO investigated by the detection of the C(3P)fragment" Chemical Physics Letters. 241. 357-361 (1995)

[Publications] Akihiro Okazaki: "Degenerate four-wave mixing spectroscopy of jet-cooled SO_2 via the C-Xtransition" Chemical Physics Letters. 241. 275-280 (1995)

[Publications] T. Sekiguchi: "Ion desorption from H_2O chemisorbed on Si(100)by O 1s electron excitation at room temperature" Journal of Chemical Physics. 102. 1422-1431 (1995)

[Publications] Kenji Honma: "The importance of electron transfer mechanism in reaction of neutral transition metal atoms" Laser Chemistry. 15. 209-220 (1995)

[Publications] Kenji Honma: "Kinetics of depletion of electronically excited Ti atom by CH_4, C_2H_2, C_2H_4, and C_2H_6" Journal of Chinese Chemical Society. 42. 371-379 (1995)

[Publications] T.Ibuki: "Radiative dissociation of superexcited C_2H_2, C_2HD, and C_2D_2 at 50-90nm region" Journal of Chemical Physics. 102. 5301-5308 (1995)

[Publications] Kenji Honma: "Laser-initiated half reaction study of H+O_2…>OH(v,J)+O" Journal of Chemical Physics. 102. 7856-7863 (1995)

[Publications] Yukito Naitoh: "Vector correlations in 193nm Photodissociation of the NO dimer" Journal of Chemical Physics. 99. 13652-13658 (1995)

[Publications] K.Senba: "Kinetics of Ti(a^3F, a^5F)and V(a^4F, a^6D)depletion by simple hydrocarbons" Journal of Chemical Physics. 99. 13992-13999 (1995)

[Publications] R.Matsui: "Kinetics of Depletion of Co(b^4F)and Co(a^2F)atoms by O_2" Chemical Physics Letters. (in press).

[Publications] Y.Endo: "PDN-FTMW spectroscopy of Open Shell Complexes" J. C. S. Faraday Discuss.97. 341-350 (1994)

[Publications] H.Kohguchi: "Pulsed-discharge nozzle Fourier-transform microwave spectroscopy of the HC_4O radical" Journal of Chemical Physics. 101. 6463-6469 (1994)

[Publications] Y.Ohshima: "Fourier-transform microwave spectroscopy of triplet carbon monoxides, C_2O, C_4O, C_6O, and C_8O" Journal of Chemical Physics. 102. 1493-1500 (1995)

[Publications] T.Ogata: "Rotational spectra and structures of carbon monoxides, C_5O, C_7O, and C_9O" J. Am. Chem. Soc.117. 3593-3598 (1995)

[Publications] Y.Kasai: "Pure rotational spectrum of FeCO" Journal of Chemical Physics. 103. 90-95 (1995)

[Publications] K.Yamanouchi: "Laser induced fluorescence spectroscopy of the C^1B_2-X^nA_1 band of jetcooled SO_2: rotational and vibrational analysis in the 235-210nm region" J. Mol. Struct.352/353. 541-559 (1995)

[Publications] Y.Ohshima: "Fourier-transform microwave spectroscopy of CCN(X^2П1/2)" J. Mol. Spectrosc.172. 225-232 (1995)

[Publications] Y.Kawashima: "Observation of the Fourier transform microwave transitions of NaBH_4 and KBH_4" J. Mol. Spectrosc.279-289 (1995)

[Publications] Yoshihiko HATANO: "“Photoabsorption, Photoionization, and Photodissociation Cross Sections" in “Atomic and Molecular Data for Radiotherapy" (edited by M.Inokuti)Chapter V" IAEA, (1995)

籏野嘉彦東京工業大学, 理学部, 教授 (90016121)