A Velocity Map Ion-imaging Study on Ketene Photodissociation at 218 nm

作     者：Jie Liu Feng-yan Wang Hua Wang Bo Jiang Xue-ming Yang Jie Liu;Feng-yan Wang;Hua Wang;Bo Jiang;Xue-ming Yang

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,