摘要
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_5F_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.
Mass - analyzed ion kinetic energy spectroscopy (MIKES) has been used to study the unimolecular and collision induced dissociation(CID) of C6F6+ ions in collision with Ar and He at 3 kV 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 C6F6+ 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.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
1999年第9期1009-1013,共5页
Acta Chimica Sinica
