Ultraviolet photolysis of H2S and its implications for SH radical production in the interstellar medium

Jiami Zhou, Yarui Zhao, Christopher S. Hansen, Jiayue Yang, Yao Chang, Yong Yu, Gongkui Cheng, Zhichao Chen, Zhigang He, Shengrui Yu, Hongbin Ding, Weiqing Zhang, Guorong Wu, Dongxu Dai, Colin M. Western, Michael N. R. Ashfold (), Kaijun Yuan () and Xueming Yang ()
Additional contact information
Jiami Zhou: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Yarui Zhao: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Christopher S. Hansen: University of New South Wales
Jiayue Yang: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Yao Chang: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Yong Yu: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Gongkui Cheng: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Zhichao Chen: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Zhigang He: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Shengrui Yu: Zhejiang Normal University
Hongbin Ding: Dalian University of Technology
Weiqing Zhang: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Guorong Wu: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Dongxu Dai: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Colin M. Western: University of Bristol
Michael N. R. Ashfold: University of Bristol
Kaijun Yuan: Dalian Institute of Chemical Physics, Chinese Academy of Sciences
Xueming Yang: Dalian Institute of Chemical Physics, Chinese Academy of Sciences

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract Hydrogen sulfide radicals in the ground state, SH(X), and hydrogen disulfide molecules, H2S, are both detected in the interstellar medium, but the returned SH(X)/H2S abundance ratios imply a depletion of the former relative to that predicted by current models (which assume that photon absorption by H2S at energies below the ionization limit results in H + SH photoproducts). Here we report that translational spectroscopy measurements of the H atoms and S(1D) atoms formed by photolysis of jet-cooled H2S molecules at many wavelengths in the range 122 ≤ λ ≤155 nm offer a rationale for this apparent depletion; the quantum yield for forming SH(X) products, Γ, decreases from unity (at the longest excitation wavelengths) to zero at short wavelengths. Convoluting the wavelength dependences of Γ, the H2S parent absorption and the interstellar radiation field implies that only ~26% of photoexcitation events result in SH(X) products. The findings suggest a need to revise the relevant astrochemical models.

Date: 2020
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DOI: 10.1038/s41467-020-15343-4

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