A Velocity Map Ion-imaging Study on Ketene Photodissociation at 218 nm
A Velocity Map Ion-imaging Study on Ketene Photodissociation at 218 nm作者机构:State Key Laboratory of Molecular Reaction Dynamics Dalian Institute of Chemical Physics ChineseAcademy of Sciences Dalian 116023 China
出 版 物:《Chinese Journal of Chemical Physics》 (化学物理学报(英文))
年 卷 期:2006年第19卷第1期
页 面:1-5页
核心收录:
学科分类:081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070303[理学-有机化学] 0703[理学-化学] 0702[理学-物理学]
基 金:This work is suppotted by the Chinese Academy of Sciences the Ministry of Science and Technology and the National Natural Science Foundation of China
主 题:Velocity map ion-imaging Photodissociation Anisotropy parameter Translational energy distribution
摘 要: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 significant 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(ǎ^1A1)+CO(X^1∑^+) channel, while the CH2(b^1B1)+CO(X^1∑^+) channel and the CH2(X^3B1)+CO(X^1E^+) channel are also likely present, (iii) The anisotropy parameters β of CO different rovibronic states all appear to be larger than zero. No significant difference is observed at the two vibrational states,