Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206...85g&link_type=abstract
Astrophysical Journal, vol. 206, May 15, 1976, pt. 1, p. 85-99.
Astronomy and Astrophysics
Astrophysics
69
Abundance, Interstellar Matter, Molecular Ions, Oxides, Oxygen Recombination, Photodissociation, Carbon Monoxide, Charge Exchange, Electron Density (Concentration), Hydroxyl Radicals, Ion Density (Concentration), Water
Scientific paper
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.
Glassgold Alfred E.
Langer William D.
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