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间氟溴苯分子240 nm紫外光解动力学
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, 合肥 230026
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DOI:10.1063/1674-0068/31/cjcp1806136
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基金项目:This work was financially supported by the National Key R&D Program of China (2017YFA0303502), the National Natural Science Foundation of China (No.21773221 and No.21727804), and the Fundamental Research Funds for the Central Universities of China.
Ultraviolet Photodissociation Dynamics of m-Bromofluorobenzene at around 240 nm
Min Chen, Hao Liang, Chao He, Dong-feng Zhao, Yang Chen
CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
Abstract:
The photodissociation dynamics of m-bromofluorobenzene has been experimentally investigated at around 240 nm 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 different 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 effect 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.
Key words:  Photodissociation dynamics  Kinetic energy release spectra  Spin-orbit coupling effect