Ultraviolet Photodissociation Dynamics of m-Bromofluorobenzene at around 240 nm  

间氟溴苯分子240 nm紫外光解动力学（英文）

作　　者：Min Chen Hao Liang Chao He Dong-fengZhao YangChen 陈旻;梁昊;何超;赵东锋;陈旸(中国科学技术大学化学物理系中国科学院量子信息与量子科技创新研究院合肥微尺度物质科学国家研究中心)

机构地区：CAS Center for Excellence for Physical Sciences at the Technology of China,Hefei in Quantum Information and Quantum Physics,Hefei National Laboratory Microscale,and Department of Chemical Physics,University of Science and 230026,China

出　　处：《Chinese Journal of Chemical Physics》2018年第4期563-567,616,共6页化学物理学报（英文）

基　　金：financially supported by the National Key R&D Program of China(2017YFA0303502);the National Natural Science Foundation of China(No.21773221 and No.21727804);the Fundamental Research Funds for the Central Universities of China

摘　　要：The photodissociation dynamics of m-brornofluorobenzene has been experimentally investi- gated at around 240 nrn using the DC-slice velocity map imaging technique. The kinetic energy release spectra and the recoiling angular distributions of fragmented Br（2P3/2） and Br（2P1/2） atoms from photodissociation of m-bromofluorobenzene have been measured at diff）rent photolysis wavelengths around 240 nm. The experimental results indicate that two dissociation pathways via （pre-）dissociation of the two low-lying 1ππ excited states dominate the production process of the ground state Br（2P3/2） atoms. Because of the weak spin-orbit coupling eff）ct among the low-lying triplet and singlet states, the spin-orbit excited Br（2P1/2） atoms are mainly produced via singlet-triplet state coupling in the dissociation step. The similarity between the present results and that recently reported for o-bromofluorobenzene indicates that the substitution position of the fluorine atom does not significantly affect the UV photodissociation dynamics of bromofluorobenzenes.

关 键 词：Photodissociation dynamics Kinetic energy release spectra Spin-orbit coupling effect 

分 类 号：O625.21[理学—有机化学]