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Title:
Abundances of simple oxygen-bearing molecules and ions in interstellar clouds
Authors:
Glassgold, A. E.; Langer, W. D.
Affiliation:
AA(New York University, New York, N.Y.), AB(New York University; NASA, Goddard Institute for Space Studies, New York, N.Y.)
Publication:
Astrophysical Journal, vol. 206, May 15, 1976, pt. 1, p. 85-99. (ApJ Homepage)
Publication Date:
05/1976
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Abundance, Interstellar Matter, Molecular Ions, Oxides, Oxygen Recombination, Photodissociation, Carbon Monoxide, Charge Exchange, Electron Density (Concentration), Hydroxyl Radicals, Ion Density (Concentration), Water
DOI:
10.1086/154358
Bibliographic Code:
1976ApJ...206...85G

Abstract

The abundances of simple oxygen-bearing interstellar molecules in warm (T at least 40 K), diffuse, and moderately thick clouds are calculated on the basis of binary gas-phase reactions. The most important reactions are ion-molecule, charge-exchange, and dissociative-recombination reactions, as suggested mainly by earlier workers. The progenitor of these molecules in diffuse clouds is the cosmic-ray-produced H(+) ion, working through the charge-exchange reaction with O. The ionization of H(+) and He(+) is also discussed. Dissociative charge exchange of He(+) with H2 is an important source of H(+) in regions of large fractional abundance of H2, as well as an important destruction mechanism for He(+) even for small f (at least 0.1). The calculated molecular abundances are consistent with some of the available observational information.

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