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Photodissociation Dynamics of Dichlorodifluoromethane (CF2Cl2) around 235 nm using Time-Sliced Velocity Map Imaging Technology
Rui Mao*1, Hong Xiao1, Yu Hu2, Qun Zhang2, Yang Chen2
1.School of Mathematics and Physics and Chemical Engineering, Changzhou Institute of Technology, Changzhou 213032, China;2.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:
Photodissociation dynamics of dichlorodifluoromethane (CF2Cl2) around 235 nm has been studied using the time-sliced velocity map imaging technology in combination with the resonance enhanced multi-photon ionization technology. By measuring the raw images of chlorine atoms which are formed via one-photon dissociation of CF2Cl2, the speed and angular distributions can be directly obtained. The speed distribution of excited-state chlorine atoms consists of high translation energy (ET) and low ET components, which are related to direct dissociation on 3Q0 state and predissociation on the ground state induced by internal conversion, respectively. The speed distribution of ground-state chlorine atoms also consists of high ET and low ET components which are related to predissociation between 3Q0 and 1Q1 states and predissociation on the ground state induced by internal conversion, respectively. Radical dissociation channel is confirmed, nevertheless, secondary dissociation and three-body dissociation channels are excluded.
Key words:  Dichlorodifluoromethane, Time-sliced velocity map imaging technology, Internal conversion
FundProject:
使用时间切片离子速度成像技术研究CF2Cl2光解动力学
茆 锐*1, 肖 虹1, 胡 瑜2, 张 群2, 陈 旸2
1.常州工学院数理与化工学院,常州 213032;2.中国科学技术大学化学物理系,合肥微尺度物质科学国家研究中心,合肥 230026
摘要:
本文使用时间切片离子速度成像技术结合共振增强多光子电离技术研究了CF2Cl2分子在235 nm附近的光解动力学. 通过测量CF2Cl2分子在235 nm附近单光子解离产生的氯原子影像,直接得到了解离产物的速度分布和角分布. 激发态氯原子的速度分布包含高动能组分和低动能组分,分别对应3Q0电子态的直接解离和由于内转换引起的基态预解离. 基态氯原子的速度分布也包含高动能组分和低动能组分,分别对应3Q01Q1电子态的预解离和由于内转换引起的基态预解离. 自由基解离通道被确认,二次解离通道和三体解离通道被排除.
关键词:  二氟二氯甲烷,时间切片离子速度成像技术,内转换
DOI:10.1063/1674-0068/cjcp1812283
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