1997 Fiscal Year Annual Research Report

分子超励起状態の生成とその解離ダイナミックス

Research Project

Project/Area Number	08102005
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)	小田切丈東京工業大学, 理学部, 助手 (80282820) 亀田幸成東京工業大学, 理学部, 助手 (90214551) 河内宣之東京工業大学, 理学部, 助教授 (50161873)
Keywords	分子超励起状態 / コインシデンス計測 / 電子エネルギー損失スペクトル / 解離 / シンクロトロン放射光 / 光学的禁制状態 / 発光励起スペクトル / 水素分子
Research Abstract	本年度は研究計画のとおり、平成8年度までに確立した装置を用い、H_2の二電子励起状態領域において散乱電子と解離断片H(2p)が放出するライマンα光子とのコインシデンス測定を行った。H_2は最も簡単な分子であり、またその二電子励起状態の多くは解離性のポテンシャル曲線を持つため、分子励起状態の解離ダイナミックスという観点では一つの典型例を与える。まずガス導入に伴う装置への悪影響を軽減するための様々な対策を施し、その後実験条件の最適化を行い、H_2電子励起状態領域において初めてコインシデンス測定に成功した。次に測定が長期間にわたる(一点のコインシデンス測定に5〜7日)ことへの対策として、実験条件に対して計数率を規格化する方法を確立した。その結果H_2二電子励起状態のスペクトルを測定した例であり、特にスペクトル中に見られる禁制電子励起状態によるピークの同定については多くの研究者の議論を呼んだ。現在ダイナミックスの情報を得るため、D_2についての同様な測定を継続している。放射光実験については、高エネルギー加速器研究機構放射光施設の休止期間中は実験室光源を用いた装置の調整を行い、その後エタン等の簡単な炭化水素について、様々な発光の発光励起スペクトルを測定し、相互に比較することで分子超励起状態の解離機構解明を試みた。比較の結果、発光を伴う光解離過程では、CH(A、B)などの励起フラグメントを生成する確率が高く、H(2p)フラグメントはInner Valence軌動を励起した場合に生成するという結果が得られた。また励起希ガス原子の衝突脱励起断面積、電子-正イオン再結合反応速度定数の測定も行い、中間体としての分子超励起状態の生成・崩壊という観点から議論した。

Research Products

(22 results)

All Other

All Publications (22 results)

[Publications] Y.Hatano: "Electron Attachment and Recombination in Dense Molecular Media" Aust.J.Phys. 50. 615-625 (1997)
[Publications] S.Machida et al: "Dissociation Dynamics of N_2O in Superexcited States As Probed by Two-Dimensional Fluorescence" J.Phys.Chem.101. 656-667 (1997)
[Publications] N.Kouchi et al: "Dissociation Dynamics of Superexcited Molecular Hydrogen" J.Phys.B. 30. 2319-2344 (1997)
[Publications] A.Ehresmann et al: "CO Rydberg Series Converging to the CO+D and C States Observed by VUF-Fluorescence Spectroscopy" J.Phys.B. 30. 1907-1926 (1997)
[Publications] D.B.KHADKA et al: "Deexcitation of Ne(^3P_1)and Ne(^3P_2)collisions with Ar, Kr,and Xe" J.Chem.Phys.107. 2386-2394 (1997)
[Publications] N.Kouchi: "Isotope effects in the dynamics of doubly excited states of molecular hydrogen and deuterium as studied by coincident electron-energy-loss spectroscopy" The book of invited papers for XX.international Conference on the Physics of Electronic and Atomic Collisions. (in press). (1997)
[Publications] N.Kouchi: "Doubly excited states of molecular hydrogen and deuterium as studied by the coincident electron-energy-loss spectroscopy" Proc.of International Symposium onEl ectron-Molecule Collisions and Ion and Electron Swarms. L15/1-L15/2 (1997)
[Publications] T.Odagiri et al: "H(2p) formation via optically forbidden states in electron-H2 collisions as studied by the coincident electron-energy-loss spectroscopy" Proc.of International Symposium onElectron-Molecule Collisions and Ion and Electron Swarms. P51 (1997)
[Publications] K.Kameta et al: "Photoabsorption cross sections and photoionization quatum yields of normal and cyclic alkanes in the extreme ultraviolet range" Proc.of the 20th International Conference on the Physics of Electronic and Atomic Collisions. 1. WE013 (1997)
[Publications] S.Machida et al: "Decay dynamics of a superexcited O_2 molecule" Proc.of the 20th International Conference on the Physics of Electronic and Atomic Collisions. 1. WE042 (1997)
[Publications] D.B.KHADKA et al: "Deexcitation cross sections of Ne(^3P_2)by Ar, Kr, Xe, and N_2" Proc.of the 20th International Conference on the Physics of Electronic and Atomic Collisions. 1. WE200 (1997)
[Publications] N.Uemura et al: "Isotope effects in the dynamics of doubly excited states of molecular hydrogen and deuterium as studied by coincident electron-energy-loss spectroscopy" Proc.of the 20th International Conference on the Physics of Electronic and Atomic Collisions. 2. MO128 (1997)
[Publications] D.B.Khadka et al: "Temperature dependence of deexcitation rate of constants of Ne(^3P_1) and Ne(^3P_2)by Ar, Kr, Xe, and N_2" Proc.of the 23th International Conference on Phenomena in Ionized Gases. 1. 74 (1997)
[Publications] N.Kouchi: "Photon-and electron-impact dissociation of simple molecules via superexcited states as studied by VUV fluorescence spectroscopy" Proc.of International Worksyop on Photoionization. 27 (1997)
[Publications] K.Kameta et al: "Photoionization and neutral-dissociation of hydrocarbons in the extreme ultraviolet range" Proc.of International Worksyop on Photoionization. 56 (1997)
[Publications] Y.Hatano et al: "Dissociation of highly excited molecules" Bull.Am.Phys.Soc.42. 1765 (1997)
[Publications] Kaoru ONOE et al: "Selective synthsis of acetylen from metane by microwave plasma reactions" Fuel. 73. 281-282 (1997)
[Publications] T.Tanabe: "Dissociative recombination of molecular ions with a l-meV temperature el ectron beam from a superconducting electron cooler at the TARN-II storage ring" Proc. of the 20th International Conference on the Physics of Electronic and Atomic Collisions. 2. TU132 (1997)
[Publications] T Tanabe et al: "First operation of the superconducting electron cooler at the storage ring TARN II" Proc.of Particle Accelerator Conference. (1997)
[Publications] T.Tanabe et al: "First operation of the liquid-helium-free superconducting electron cooler at the TARN II storage ring" Proc.of The16th RCNP Osaka international Symposium on Multi-GeV High-Performance Accelerators and Related Technology. 41-46 (1997)
[Publications] 籏野嘉彦: "活性な分子の新しい世界" 物質(もの)とは-その機能と変換. 107-117 (1997)
[Publications] 籏野嘉彦: "フリーラジカルの科学" 学会出版センター, 33 (1998)

1997 Fiscal Year Annual Research Report

分子超励起状態の生成とその解離ダイナミックス

Principal Investigator

籏野 嘉彦 東京工業大学, 理学部, 教授 (90016121)

Research Products

[Publications] Y.Hatano: "Electron Attachment and Recombination in Dense Molecular Media" Aust.J.Phys. 50. 615-625 (1997)

[Publications] S.Machida et al: "Dissociation Dynamics of N_2O in Superexcited States As Probed by Two-Dimensional Fluorescence" J.Phys.Chem.101. 656-667 (1997)

[Publications] N.Kouchi et al: "Dissociation Dynamics of Superexcited Molecular Hydrogen" J.Phys.B. 30. 2319-2344 (1997)

[Publications] A.Ehresmann et al: "CO Rydberg Series Converging to the CO+D and C States Observed by VUF-Fluorescence Spectroscopy" J.Phys.B. 30. 1907-1926 (1997)

[Publications] D.B.KHADKA et al: "Deexcitation of Ne(^3P_1)and Ne(^3P_2)collisions with Ar, Kr,and Xe" J.Chem.Phys.107. 2386-2394 (1997)

[Publications] N.Kouchi: "Doubly excited states of molecular hydrogen and deuterium as studied by the coincident electron-energy-loss spectroscopy" Proc.of International Symposium onEl ectron-Molecule Collisions and Ion and Electron Swarms. L15/1-L15/2 (1997)

[Publications] T.Odagiri et al: "H(2p) formation via optically forbidden states in electron-H2 collisions as studied by the coincident electron-energy-loss spectroscopy" Proc.of International Symposium onElectron-Molecule Collisions and Ion and Electron Swarms. P51 (1997)

[Publications] K.Kameta et al: "Photoabsorption cross sections and photoionization quatum yields of normal and cyclic alkanes in the extreme ultraviolet range" Proc.of the 20th International Conference on the Physics of Electronic and Atomic Collisions. 1. WE013 (1997)

[Publications] S.Machida et al: "Decay dynamics of a superexcited O_2 molecule" Proc.of the 20th International Conference on the Physics of Electronic and Atomic Collisions. 1. WE042 (1997)

[Publications] D.B.KHADKA et al: "Deexcitation cross sections of Ne(^3P_2)by Ar, Kr, Xe, and N_2" Proc.of the 20th International Conference on the Physics of Electronic and Atomic Collisions. 1. WE200 (1997)

[Publications] N.Uemura et al: "Isotope effects in the dynamics of doubly excited states of molecular hydrogen and deuterium as studied by coincident electron-energy-loss spectroscopy" Proc.of the 20th International Conference on the Physics of Electronic and Atomic Collisions. 2. MO128 (1997)

[Publications] D.B.Khadka et al: "Temperature dependence of deexcitation rate of constants of Ne(^3P_1) and Ne(^3P_2)by Ar, Kr, Xe, and N_2" Proc.of the 23th International Conference on Phenomena in Ionized Gases. 1. 74 (1997)

[Publications] N.Kouchi: "Photon-and electron-impact dissociation of simple molecules via superexcited states as studied by VUV fluorescence spectroscopy" Proc.of International Worksyop on Photoionization. 27 (1997)

[Publications] K.Kameta et al: "Photoionization and neutral-dissociation of hydrocarbons in the extreme ultraviolet range" Proc.of International Worksyop on Photoionization. 56 (1997)

[Publications] Y.Hatano et al: "Dissociation of highly excited molecules" Bull.Am.Phys.Soc.42. 1765 (1997)

[Publications] Kaoru ONOE et al: "Selective synthsis of acetylen from metane by microwave plasma reactions" Fuel. 73. 281-282 (1997)

[Publications] T.Tanabe: "Dissociative recombination of molecular ions with a l-meV temperature el ectron beam from a superconducting electron cooler at the TARN-II storage ring" Proc. of the 20th International Conference on the Physics of Electronic and Atomic Collisions. 2. TU132 (1997)

[Publications] T Tanabe et al: "First operation of the superconducting electron cooler at the storage ring TARN II" Proc.of Particle Accelerator Conference. (1997)

[Publications] T.Tanabe et al: "First operation of the liquid-helium-free superconducting electron cooler at the TARN II storage ring" Proc.of The16th RCNP Osaka international Symposium on Multi-GeV High-Performance Accelerators and Related Technology. 41-46 (1997)

[Publications] 籏野嘉彦: "活性な分子の新しい世界" 物質(もの)とは-その機能と変換. 107-117 (1997)

[Publications] 籏野嘉彦: "フリーラジカルの科学" 学会出版センター, 33 (1998)

籏野嘉彦東京工業大学, 理学部, 教授 (90016121)