Journal
NATURE COMMUNICATIONS
Volume 11, Issue 1, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/s41467-020-15343-4
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Funding
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB17000000]
- Chemical Dynamics Research Center [21688102]
- National Natural Science Foundation of China (NSFC) [21873099, 21673232, 21673234, 21922306]
- international partnership program of Chinese Academy of Sciences [121421KYSB20170012]
- Australian Research Council Discovery Early Career Award [DE200100549]
- Engineering and Physical Sciences Research Council (EPSRC) [EP/L005913]
- NSFC Center for Chemical Dynamics
- EPSRC [EP/L005913/1] Funding Source: UKRI
- Australian Research Council [DE200100549] Funding Source: Australian Research Council
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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(D-1) atoms formed by photolysis of jet-cooled H2S molecules at many wavelengths in the range 122 <= lambda <= 155 nm offer a rationale for this apparent depletion; the quantum yield for forming SH(X) products, Gamma, decreases from unity (at the longest excitation wavelengths) to zero at short wavelengths. Convoluting the wavelength dependences of Gamma, the H2S parent absorption and the interstellar radiation field implies that only similar to 26% of photoexcitation events result in SH(X) products. The findings suggest a need to revise the relevant astrochemical models.
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