Enhanced production of HD and D_2 molecules on small dust grains in diffuse clouds

Details Enhanced production of HD and D_2 molecules on small dust grains in diffuse clouds Enhanced production of HD and D_2 molecules on small dust grains in diffuse clouds

2003-11-23

arxiv.org/abs/astro-ph/0311524v1

Mon.Not.Roy.Astron.Soc. 348 (2004) 1055

Astronomy and Astrophysics

Astrophysics

This is a preprint of an article accepted for publication in Monthly Notices of The Royal Astromnomical Society

Scientific paper

10.1111/j.1365-2966.2004.07437.x

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 (vs. 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 with the enhancement due to gas-phase ion-molecule reactions in diffuse clouds.

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