Surface chemistry of deuterated molecules

Details Surface chemistry of deuterated molecules Surface chemistry of deuterated molecules

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...119..177t&link_type=abstract

Astronomy and Astrophysics, vol. 119, no. 2, Mar. 1983, p. 177-184.

Astronomy and Astrophysics

Astrophysics

136

Deuterides, Interstellar Chemistry, Molecular Clouds, Surface Reactions, Abundance, Chemical Composition, Gas Density, Grain Boundaries, Hydrogenation, Vapor Phases

Scientific paper

The chemical composition of grain mantles is calculated in order to determine the concentration of deuterated molecules relative to their hydrogenated counterparts in grain mantles. The computation takes into account reactions involving deuterium in the gas phase and on grain surfaces. The results show that the abundance of deuterium molecules in grain mantles is much higher than expected on the basis of the cosmic abundance ratio of D to H. HDCO has a relatively high abundance in grain mantles as compared to other deuterated molecules, due to the fact that H abstraction from HDCO has a lower activation barrier than D abstraction. The infrared characteristics of the calculated grain mantles are discussed and observational tests of the model calcultions are suggested. The contribution of grain surface chemistry to the concentration of molecules in the gas phase is briefly considered.

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