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Physico-chemical Behavior of Hydrogen Sulfide Induced by Reactions with H and D Atoms on Different Types of Ice Surfaces at Low Temperature

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Title: Physico-chemical Behavior of Hydrogen Sulfide Induced by Reactions with H and D Atoms on Different Types of Ice Surfaces at Low Temperature
Authors: Oba, Yasuhiro Browse this author
Tomaru, Takuto Browse this author
Kouchi, Akira Browse this author →KAKEN DB
Watanabe, Naoki Browse this author →KAKEN DB
Keywords: astrochemistry
ISM: clouds
ISM: molecules
Issue Date: 1-Apr-2019
Publisher: IOP Publishing
Journal Title: Astrophysical journal
Volume: 874
Issue: 2
Start Page: 124
Publisher DOI: 10.3847/1538-4357/ab0961
Abstract: To elucidate the physico-chemical behavior of hydrogen sulfide (H2S) on icy grains in dense molecular clouds, we investigated the surface reactions of solid H2S with H and D atoms in low-temperature laboratory experiments. We confirmed that H2S was lost from the surface by reaction with H atoms via chemical desorption. We found no strong association between the effective desorption cross section and the ice structure (porous amorphous, nonporous amorphous, or crystalline) or temperature (10-30 K). At 10 K, the reaction rate constant for the H-D substitution of solid H2S with D atoms almost matched that for the D-H substitution of solid D2S with H atoms. The present experimental results clearly suggest that the observed abundances of H2S and its deuterated isotopologues (HDS and D2S) in the interstellar medium are controlled, at least partly, by surface reactions on interstellar icy grains.
Rights: This is an author-created, un-copyedited version of an article accepted for publication/published in Astrophysical journal. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at 10.3847/1538-4357/ab0961.
Type: article (author version)
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 大場 康弘

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