Journal
ASTROPHYSICAL JOURNAL
Volume 627, Issue 2, Pages 850-860Publisher
IOP PUBLISHING LTD
DOI: 10.1086/430435
Keywords
astrochemistry; dust, extinction; ISM : abundances; ISM : molecules; molecular processes
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The results of experiments on the formation of molecular hydrogen on low-density and high-density amorphous ice surfaces are analyzed using a rate equation model. The activation energy barriers for the relevant diffusion and desorption processes are obtained. The more porous morphology of the low-density ice gives rise to a broader spectrum of energy barriers compared to the high-density ice. Inserting these parameters into the rate equation model under steady-state conditions, we evaluate the production rate of molecular hydrogen on ice-coated interstellar dust grains.
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