Ion-Pair Dissociations of Br CN by Electron Impacts  

BrCN分子的电子碰撞离子对解离（英文）

作　　者：Xiao-fei Gao Hao Li Xin Meng Shan-xi Tian 高小飞;李浩;孟鑫;田善喜(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)

机构地区：[1]Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China

出　　处：《Chinese Journal of Chemical Physics》2019年第1期89-92,I0002,共5页化学物理学报（英文）

基　　金：supported by the National Natural Science Foundation of China (No.21625301)

摘　　要：Ion-pair dissociation is an important molecular process and frequently happens when the target molecule is pumped to its electronically superexcited states. In contrast to the experimental studies of photoexcitation ion-pair dissociation, there are some experimental challenges in the electron-impact ion-pair dissociation study, in particular, on determination of the energetic threshold. Here we report an experimental development for the ion-pair dissociation study by using the monochromized electron impacts. As an example, the threshold of BrCN→Br^-+CN^+ is determined as 13.78 eV according to the appearance energy of CN^+ signals, meanwhile, the time-sliced ion velocity image of CN^+ is recorded at 16.09 eV and indicates an anisotropic distribution of the CN^+ momentum.

关 键 词：Ion-pair dissociation Electron impact Molecular superexcited state Ion velocity image Dissociation threshold 

分 类 号：O643.12[理学—物理化学]