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ISSN 1000-6818CN 11-1892/O6CODEN WHXUEU
Acta Phys Chim Sin >> 0,Vol.>> Issue()>> 0-0     doi: 10.3866/PKU.WHXB201705183         中文摘要
Accepted manuscript
S(3P) Fragmentation Channel of Carbonyl Sulfide at 230 nm
WU Xiang-Kun, GAO Zhi, YU Tong-Po, ZHOU Xiao-Guo, LIU Shi-Lin
Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, P. R. China
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Carbonyl sulfide (OCS) was photoexcited at 230 nm so that it dissociated into a vibrationally cold but rotationally hot CO (X1Σg+, v = 0, J = 42–69) fragment, which was eventually subjected to resonance enhanced multiphoton ionization. The kinetic energy release distribution and angular distribution of the CO fragment were obtained by detecting the time-sliced velocity map images of CO+ in various rotational states (J = 55–69), wherein both the singlet dissociation channel of S(1D) + CO and the triplet pathway of S(3PJ) + CO were involved. For the triplet fragment channel, the total quantum yield of OCS dissociation at 230 nm was estimated to be 4.16%, based on the measured branching ratioin every rotational state. High-level quantum chemical calculations on the potential energy surface and the absorption cross section of OCS revealed the dissociation mechanism along the triplet channel of OCS, with photolysis at 230 nm. The ground state OCS (X1A') is photoexcited to the bent A1A' state at 230 nm, which then decays back to X1A' in a bent structure via internal conversion and subsequently couples to the 23A"(c3A") state by spin-orbit coupling, followed by direct dissociation along its potential energy surface.



Keywords: Carbonyl sulfide (OCS)   Photodissociation   Resonance enhanced multiphoton ionization   Branching ratio   Ion velocity imaging  
Received: 2017-04-22 Accepted: 2017-05-10 Publication Date (Web): 2017-05-18
Corresponding Authors: ZHOU Xiao-Guo Email: xzhou@ustc.edu.cn

Fund: The project was supported by the National Natural Science Foundation of China (21373194 and 21573210), National Key Research and Development Program (2016YFF0200502), National Key Basic Research Program of China (973) (2013CB834602) and the Ministry of Science and Technology of China (2012YQ220113).

Cite this article: WU Xiang-Kun, GAO Zhi, YU Tong-Po, ZHOU Xiao-Guo, LIU Shi-Lin . S(3P) Fragmentation Channel of Carbonyl Sulfide at 230 nm[J]. Acta Phys. -Chim. Sin., 0, (): 0-0.    doi: 10.3866/PKU.WHXB201705183

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