Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...114..245t&link_type=abstract
Astronomy and Astrophysics, vol. 114, no. 2, Oct. 1982, p. 245-260. Research supported by the Nederlandse Organisatie voor Zuiv
Astronomy and Astrophysics
Astronomy
396
Chemical Composition, Granular Materials, Interstellar Chemistry, Interstellar Matter, Molecular Clouds, Astronomical Models, Infrared Astronomy, Interstellar Extinction, Surface Reactions
Scientific paper
A chemical reaction scheme comprising gas phase as well as grain surface reactions is used for the numerical calculation of the chemical composition of mantles accreting on interstellar grains. The composition of the growing grain mantle is determined on the basis of the relative accretion rates of the gas phase molecules and diffusion-controlled surface reactions. Results show that grain mantles generally consist of the molecules H2O, H2CO, N2, O2, CO, CO2, H2O2, and NH3. A detailed examination of the formation of H2 on grain surfaces leads to the conclusion that it proceeds through hydrogen abstraction from such molecules as H2CO, H2S, N2H2, and N2H4. The IR characteristics of the calculated grain mantles are discussed with emphasis on the observed ice band at the 3250/cm wavelength.
Hagen Wim
Tielens Alexander G. G. M.
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