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Photodissociation Dynamics of OCS Near 128 nm: S(3PJ=2,1,0), S(1D2) and S(1S0) Channels
Si-wen Wang1, Dao-fu Yuan1, Wen-tao Chen1, Ling Tang1, Sheng-rui Yu2, Xue-ming Yang3,4, Xing-an Wang*1
1.Hefei National Laboratory for Materials Science at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China;2.Hangzhou Institute of Advanced Studies, Zhejiang Normal University, Hangzhou 311231, China;3.State key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China;4.School of Science, Southern University of Science and Technology, Shenzhen 518055, China
Abstract:
Here we report the study of the photodissociation dynamics of carbonyl sulfide in the vacuum ultraviolet region using the time-sliced velocity map ion imaging technique. Images of S(3PJ=2,1,0), S(1D2) and S(1S0) products were measured at four photolysis wave-lengths of 129.32, 128.14, 126.99, and 126.08 nm, respectively. Four main dissociation channels: S(3PJ=2,1,0)+CO(X1Σ+), S(3PJ=2,1,0)+CO(A3π), S(1D2)+CO(X1Σ+) and S(1S0)+CO(X1Σ+) channels, have been clearly observed and identified. Vibrational states of the CO co-products were partially resolved in the experimental images. From these images, the product total kinetic energy releases, the branching ratios and angular distributions of products have been derived. While the S(3PJ=2,1,0)+CO(A3π) product channel is formed through the adiabatic dissociation process after the excitation to the (31Σ+) excited state, the results suggest that strong nonadiabatic coupling plays an important role in the formation of other three channels.
Key words:  Vacuum ultraviolet photodissociation, Carbonyl sufide, Velocity map ion imaging
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附件
OCS分子在128 nm附近的光解动力学研究:S(3PJ=2,1,0)、S(1D2)以及S(1S0)产物通道
王思雯1, 袁道福1, 陈文韬1, 唐 翎1, 俞盛锐2, 杨学明3,4, 王兴安*1
1.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;2.浙江师范大学杭州高等研究院, 杭州 311231;3.中国科学院大连化学物理研究所,分子反应动力学国家重点实验室, 大连 116023;4.南方科技大学理学院化学系,深圳 518055
摘要:
本文利用时间切片离子成像技术对OCS分子进行了真空紫外波段的光解动力学研究. 在四个光解光波长(从129.32到126.08 nm)下测量了硫原子解离产物S(3PJ=2,1,0)、S(1D2)、S(1S0)的速度影像,并从中清晰地发现了四个主要的解离产物通道:S(3PJ=2,1,0)+CO(X1Σ+),S(3PJ=2,1,0)+CO(A3π),S(1D2)+CO(X1Σ+)和S(1S0)+CO(X1Σ+). 在实验影像中,产物CO分子的部分振动态结构能够得到分辨. 实验还获取解离产物总平动能谱,产物分支比和角分布. 对实验结果进行分析显示除绝热解离通道S(3PJ=2,1,0)+CO(A3π)之外,在其他三个产物通道中非绝热效应都起到非常重要的作用.
关键词:  真空紫外光解,OCS,离子速度影像
DOI:10.1063/1674-0068/cjcp1911179
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