Fragmentation Dynamics of a Carbon Dioxide Dication Produced by Ion Impact

• DOI: 10.1021/acs.jpclett.2c01908
• Publication Date: 2022-08-11T13:32:51Z
• Authors: Hang Yuan; Shenyue Xu; Enliang Wang; Jiawei Xu; Yue Gao; Xiaolong Zhu; Dalong Guo; Binghui Ma; Dongmei Zhao; Shaofeng Zhang; Shuncheng Yan; Ruitian Zhang; Yong Gao; Zhongfeng Xu; Xinwen Ma
• Keywords: Fragmentation; Dication

The response of carbon dioxide to radiolysis is crucial for understanding the atmospheric chemistry planets. Here, we present a combined experimental and theoretical investigation three-body fragmentation dynamics CO22+ C+ + O+ O initiated by 1 keV/u Ar2+ impact. Taking advantage kinematic complete measurement employing reaction microscope, three dissociation mechanisms are distinguished, their branching ratios determined. concerted with two C–O bonds breaking simultaneously dominant, while sequential pathway CO+ as intermediate also makes significant contribution. Also, novel isomerization transitory formation O2+ identified. identified can contribute escaping from Martian atmosphere, since kinetic energies most fragments observed be higher than escape energy oxygen.