期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 348, 期 3, 页码 1055-1064出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2004.07437.x
关键词
molecular processes; ISM : molecules
Motivated by recent observations of deuterated molecules in the interstellar medium, we examine the production of HD and D-2 molecules on dust grain surfaces. A mechanism for the enhanced production of these deuterated molecules is studied. This mechanism applies on grain surfaces on which D atoms stick more strongly than H atoms, under conditions of low flux and within a suitable range of temperatures. It is shown that under these conditions the production rates of HD and D-2 are greatly enhanced (versus the H-2 production rate) compared with the expected rates based on the adsorption of gas-phase atomic abundances of D and H. The enhancement in the formation rate of HD is comparable to the enhancement due to gas-phase ion-molecule reactions in diffuse clouds.
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