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Fei Xu, Yuxin Tan, Daofu Yuan, Wentao Chen, Shengrui Yu, Ting Xie, Tao Wang, Xueminig Yang, Xingan Wang. Wavelength dependent photodissociation of OCS via the F 31Π Rydberg state: the CO (X1Σ+) + S (1D2) product channel[J]. Chinese Journal of Chemical Physics .
Citation: Fei Xu, Yuxin Tan, Daofu Yuan, Wentao Chen, Shengrui Yu, Ting Xie, Tao Wang, Xueminig Yang, Xingan Wang. Wavelength dependent photodissociation of OCS via the F 31Π Rydberg state: the CO (X1Σ+) + S (1D2) product channel[J]. Chinese Journal of Chemical Physics .
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Wavelength dependent photodissociation of OCS via the F 31Π Rydberg state: the CO (X1Σ+) + S (1D2) product channel

  • 1. Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, School of Chemistry and Materials Science, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, P. R. China;

  • 2. Hangzhou Institute of Advanced Studies, Zhejiang Normal University, 1108 Gengwen Road, Hangzhou, Zhejiang 311231, P. R. China;

  • 3. State key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, Liaoning 116023, P. R. China;

  • 4. College of Science, Sothern University of Science and Technology. 1088 Xueyuan Raod, Shenzhen, Guangdong 518055, P. R. China

Funds:

This work was supported by the National Key R&D Program of China, (Grant No. 2017YFF0104500), the National Natural Science Foundation of China (Grant Nos. 21473173, 21590802, 21673216, 21773213), the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB17000000). We thank Bin Jiang and Xiaoguo Zhou for helpful discussions.

  • Received Date: 2020-09-13
    Available Online: 2020-11-04
    Abstract

  • The vacuum ultraviolet (VUV) photodissociation of OCS via the F 31Π Rydberg states was investigated in the range of 134–140 nm, by means of the time-sliced velocity map ion imaging technique. The images of S (1D2) products from the CO (X1Σ+) + S (1D2) dissociation channel were acquired at five photolysis wavelengths, corresponding to a series of symmetric stretching vibrational excitations in OCS (F 31Π, v1=0-4). The total translational energy distributions, vibrational populations and angular distributions of CO (X1Σ+, v) coproducts were derived. The analysis of experimental results suggests that the excited OCS molecules dissociate to CO (X1Σ+) and S (1D2) products via non-adiabatic couplings between the upper F 31Π states and the lower-lying states both in the C∞v and Cs symmetry. Furthermore, strong wavelength dependent behavior has been observed: the greatly distinct vibrational populations and angular distributions of CO (X1Σ+, v) products from the lower (v1=0-2) and higher (v1=3,4) vibrational states of the excited OCS (F 31Π, v1) demonstrate that very different mechanisms are involved in the dissociation processes. This study provides evidence for the possible contribution of vibronic coupling and the crucial role of vibronic coupling on the VUV photodissociation dynamics.

     

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