Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.298..562w&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 298, Issue 2, pp. 562-568.
Astronomy and Astrophysics
Astronomy
54
Molecular Processes, Ism: Abundances, Ism: Clouds, Ism: Molecules
Scientific paper
Several processes have been suggested as ways of returning accreted grain mantles to the gas, thus preventing the total removal of molecules from the gas phase in dark quiescent clouds. We attempt to distinguish between them by considering not only the calculated gas-phase abundances, but also the ratio of the abundances of deuterated species to non-deuterated species. We find that the D/H ratio in molecules is relatively model-independent, but that desorption due to the formation of H_2 on grains gives the best overall agreement with the observations.
Millar Thomas J.
Willacy Karen
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