Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.209...33m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 209, July 1, 1984, p. 33-49.
Astronomy and Astrophysics
Astronomy
25
Cosmic Dust, Grains, Interstellar Chemistry, Molecular Clouds, Astronomical Models, Carbon Monoxide, Gas Density, Hydroxyl Radicals, Surface Reactions
Scientific paper
Theoretical modeling of the chemistry in diffuse clouds, both including and excluding a contribution from chemical reactions on dust grain surfaces, is compared with observational data. The possible ambiguities arising when interstellar parameters are inferred from such models are illustrated by reference to OH and CO. It is shown that the molecule NH should be very close to detection if grains do contribute to the chemistry, and a deeper search is recommended. The CH and CN observations are discussed in detail; it is found that the uncertainties in the observations are currently so great that model chemistries with and without a contribution from surface reactions provide a satisfactory fit to the observations.
Mann P. C. A.
Williams David. A.
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