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2019ApJ...874..124O - Astrophys. J., 874, 124-124 (2019/April-1)

Physico-chemical behavior of hydrogen sulfide induced by reactions with H and D atoms on different types of ice surfaces at low temperature.

OBA Y., TOMARU T., KOUCHI A. and WATANABE N.

Abstract (from CDS):

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, non-porous 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.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): astrochemistry - ISM: clouds - ISM: molecules

Simbad objects: 4

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2019.09.16-19:33:16

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