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化学学报
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化学学报 ›› 1999, Vol. 57 ›› Issue (9): 1009-1013. 上一篇    下一篇

研究论文

C~6F~6^+→C~6F~5^++F气相单分子分解及碰撞诱导分解 反应研究

王建华;X.D.Zhou;A.K.Shukla;J.H.Futrell   

  1. 山东省烟台师范学院化学系;Department of Chemistry and Biochemistry, University of;Delaware
  • 发布日期:1999-09-15

Study on unimolecular and collision induced dissociation of C~6F~6^+ on collision with Ar and He

Wang Jianhua;X.D.Zhou ;A.K.Shukla ;J.H.Futrell   

  • Published:1999-09-15

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用质量分析离子动能谱(MIKES)研究了C~6F~6^+→C~6F~5^++F的气相单分子分解及其与Ar和He的碰撞诱导分解(CID)反应。实验结果表明,C~6F~6^+在电离室中获得足够能量而被激发到某一长效激发态,而CID是诱导其分解的必要步骤,且该分解过程有两条能量不同的反应途径。当碰撞气体为Ar时,两条途径所对应的能量变化分别为0eV和+9.8eV(将多余能量转化为动能),而当碰撞气体为He时,则分别为0eV和-17eV(将多余能量转化为内能)。CID/Ar诱导该长效激发态在C-F键断裂之前将多余能量转化为动能,而在CID/He中则将多余能量转化为内能。

关键词: 质量分析离子动能谱, 单分子反应, 分解反应, 碰撞诱导分解, 亚稳态, 六氟代苯, 氦, 氩

Mass-analyzed ion kinetic energy spectroscopy (MIKES) has been used to study the unimolecular and collision induced dissociation (CID) of C~6F~6^+ ions in collision with Ar and He at 3kV ion energy. The results indicated that C-F bond cleavage occurred via two channels. The corresponding energy shifts were 0eV (channel 1) and +9.8eV (channel 2) with Ar as collision gas, and 0eV (channel 1) and -17eV (channel 2) with He as collision gas. It also showed that C~6F~6^+ produced in the ion source was in a long-lived excited state of 17eV above the ground state. CID/Ar triggers its dissociation and releases the excess energy as kinetic energy or transfers the excess energy into internal energy.

Key words: UNIMOLECULAR REACTION, DECOMPOSITION REACTION, METASTABLE STATES, HELIUM, ARGON

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