Direct Observation of the C + S2 Channel in CS2 Photodissociation

• DOI: 10.1021/acs.jpclett.0c03386
• Publication Date: 2021-01-14T00:17:51Z
• Authors: Zhenxing Li; Min Zhao; Ting Xie; Zijie Luo; Yao Chang; Gongkui Cheng; Jiayue Yang; Zhichao Chen; Weiqing Zhang; Guorong Wu; Xingan Wang; Kaijun Yuan; Xueming Yang
• Keywords: Triatomic molecule

Carbon disulfide (CS2) is a typical triatomic molecule. Its photodissociation process has generally been assumed to proceed CS and S primary products via single bond fission. However, recent theoretical calculations suggested that an exit channel produce C + S2 should also be energetically accessible. Here, we report the direct experimental evidence for in CS2 by using velocity map ion imaging technique with two-photon UV one-photon vacuum (VUV) excitations. The detection of (3P) illustrates ground state electronically excited states coproducts are formed within highly vibrational states. very weak anisotropic distributions indicate relatively slow dissociation processes. possible mechanism involves molecular isomerization linear-CSS from 1B2 (21Σ+) vibronic coupling 1Π followed avoided crossing surface. Our results imply molecules observed comets might primarily photodissociation.