The formation of molecules in interstellar clouds from singly and multiply ionized atoms

Details The formation of molecules in interstellar clouds from singly and multiply ionized atoms The formation of molecules in interstellar clouds from singly and multiply ionized atoms

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225..860l&link_type=abstract

Astrophysical Journal, Part 1, vol. 225, Nov. 1, 1978, p. 860-868.

Astronomy and Astrophysics

Astrophysics

18

Interstellar Chemistry, Ionized Gases, Molecular Gases, Plasma Clouds, Reaction Kinetics, X Ray Sources, Abundance, Carbon, Gas Ionization, Hydrogen, Interstellar Gas, Ionic Reactions, Monatomic Gases

Scientific paper

The suggestion is considered that multiply ionized atoms produced by K- and L-shell X-ray ionization and cosmic-ray ionization can undergo ion-molecule reactions and also initiate molecule production. The role of X-rays in molecule production in general is discussed, and the contribution to molecule production of the C(+) radiative association with hydrogen is examined. Such gas-phase reactions of singly and multiply ionized atoms are used to calculate molecular abundances of carbon-, nitrogen-, and oxygen-bearing species. The column densities of the molecules are evaluated on the basis of a modified version of previously developed isobaric cloud models. It is found that reactions of multiply ionized carbon with H2 can contribute a significant fraction of the observed CH in diffuse interstellar clouds in the presence of diffuse X-ray structures or discrete X-ray sources and that substantial amounts of CH(+) can be produced under certain conditions.

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