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The Mobility of a Hydrogen Atom on an Icy Mantle

Published online by Cambridge University Press:  27 February 2018

Koichi Masuda
Koichi Masuda*
Affiliation:
The Graduate School of Sci. and Technol., Kobe Univ., Nada 657, Japan

Abstract

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It is probable that most molecules in space are formed on the surface of small solid grains in dense molecular clouds. Such grains have generally accumulated icy mantles inside dark clouds. We have investigated the dynamical behavior of a hydrogen atom impinging on the mantle consisting of amorphous water ice based on an MD (Molecular Dynamics) computer simulation to estimate the structure of the resulting grains with the icy mantles. We have found that the hydrogen atoms impinging on the surface of amorphous water ice were easily trapped in a dent of the surface and, consequently they are fixed there firmly. Our results, which neglect tunneling, suggest that the migration of hydrogen atoms over a large region of the surface of icy grains may be less common than is often assumed.

Type
XII. Physical Processes and Laboratory Analyses
Information
International Astronomical Union Colloquium , Volume 150: Physics, Chemistry and Dynamics of Interplanetary Dust , 1996 , pp. 469 - 472
Copyright
Copyright © Astronomical Society of the Pacific 1996

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