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Photodissociation Dynamics of OCS at 217 nm
Xi-lin Bai,Hao Liang,Zheng-fang Zhou,Ze-feng Hua,Dong-feng Zhao*,Yang Chen*
Author NameAffiliationE-mail
Xi-lin Bai CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemical physics, University of Science and Technology of China, Hefei 230026, China  
Hao Liang CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemical physics, University of Science and Technology of China, Hefei 230026, China  
Zheng-fang Zhou CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemical physics, University of Science and Technology of China, Hefei 230026, China  
Ze-feng Hua CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemical physics, University of Science and Technology of China, Hefei 230026, China  
Dong-feng Zhao* CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemical physics, University of Science and Technology of China, Hefei 230026, China dzhao@ustc.edu.cn 
Yang Chen* CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei National Laboratory for Physical Sciences at the Microscale, and Department of Chemical physics, University of Science and Technology of China, Hefei 230026, China yangchen@ustc.edu.cn 
Abstract:
The S(1D2)+CO(X1Σ+) product channel from photodissociation of OCS at 217 nm has been measured using the DC slice velocity map imaging (VMI) technique in combination with resonance enhanced multiphoton ionization (REMPI). Two diflerent REMPI intermediate states (1F3 and 1P1) and several pump-probe laser polarization geometries are used to detect the angular momentum polarization of the photofragmented S(1D2). The molecular- frame polarization parameters, as well as the laboratory-frame anisotropy parameters, for individual rotational states of co-fragment CO, are determined using two diflerent full quantum theories. The measured total kinetic energy release spectrum from photodissociation of OCS indicates two dissociation channels, corresponding to the fast and slow recoiling velocities of S(1D2), respectively. The slow channel is concluded to originate from an initial photoexcitation to the A(1A') state, followed by a non-adiabatic transition to the ground state. The fast channel is found to follow a coherent excitation to A(1A') and B(1A') states, where contributions of the two states are almost equal at 217 nm. The determined alignment and anisotropy parameters further indicate that the slow channel follows an incoherent excitation, while the fast channel follows a coherent excitation to A(1A') and B(1A') states with a phase di erence of π/2.
Key words:  Photodissociation dynamics  Carbonyl sul de  Velocity map imaging
FundProject:This work is supported by the National Key R&D Program of China (2017YFA0303502 and 2013CB834602), the National Natural Science Foun- dation of China (No.21273212, No.21173205, and No.91127042), and the Fundamental Research Funds for the Central Universities.
OCS在217 nm的光解动力学研究
白西林,梁昊,周郑芳,华泽丰,赵东锋*,陈旸*
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DOI:10.1063/1674-0068/30/cjcp1705092
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