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Velocity Map Ion-imaging Study on Ketene Photodissociation at 218 nm
Jie Liu, Feng-yan Wang, Hua Wang, Bo Jiang, Xue-ming Yang*
State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
Abstract:
Photodissociation dynamics of ketene at 218 nm has been investigated using the velocity map ion-imaging method. Both angular and translational energy distributions for the CO products at different rotational and vibrational states have been obtained. The 2+1 REMPI spectrum of CO products is also obtained. The results are as bellow: (i) CO products in the first two vibrational states ( v”=0 and v”=1 ) exhibit signiffcant rotational excitation. Furthermore the rotational excitation of CO at the v”=0 level is noticeably higher than that at the v”=1 level. (ii) It was found that the major photodissociation pathway of ketene at 218 nm is the CH2(a1A1)+CO(X1Σ+) channel, while the CH2(b1B1)+CO(X1Σ+) channel and the CH2 (X 3B1)+CO(X1Σ+) channel are also likely present. (iii) The anisotropy parameters b of CO different rovibronic states all appear to be larger than zero. No significant difference is observed at the two vibrational states. 30 Refs. In English
Key words:  Velocity map ion-imaging, Photodissociation, Anisotropy parameter, Translational energy
FundProject:
Ketene的218 nm光解的速度离子成像研究
刘杰        , 王凤燕, 汪华, 姜波, 杨学明*
中国科学院大连化学物理研究所分子反应动力学国家重点实验室,大连,116023
摘要:
用离子速度成像方法研究了乙烯酮分子在218 nm光解下的光解动力学,得到了光解产物CO的共振多光子电离谱,以及在不同振转态的角分布和平动能分布.得出如下结论:(1)CO(X1∑+)在v=0和v=1两个振动态都具有较热的转动激发,而且在v=0振动态的转动激发要比在v=1振动态的转动激发高;(2)乙烯酮分子在218nm光解的主要通道是产生CH2(a1A1)+CO(X1∑,+)产物通道,同时产生CH2(61B1)+CO(X1∑+)和CH2(X3B1)+CO(X1∑+)产物通道也可能存在.(3)光解产物CO在不同振转态的各向异性参数β都大于零,对于不同的振动态观察到的现象没有明显地不同.
关键词:  离子速度成像  光解  各向异性参数  平动能分布
DOI:10.1360/cjcp2006.19(1).1.5
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