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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*
Author NameAffiliationE-mail
Jie Liu State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China  
Feng-yan Wang State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China  
Hua Wang State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China  
Bo Jiang State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China  
Xue-ming Yang* State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China xmyang@dicp.ac.cn 
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*
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
分类号: