Production of interstellar HCN and HNC

Details Production of interstellar HCN and HNC Production of interstellar HCN and HNC

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347..855b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 15, 1989, p. 855-858.

Astronomy and Astrophysics

Astrophysics

16

Association Reactions, Hydrocyanic Acid, Interstellar Chemistry, Interstellar Matter, Radiative Recombination, Abundance, Electron Recombination, Molecular Clouds, Molecular Energy Levels

Scientific paper

The pathways of radiative deexcitation of the species H + C + N, which then becomes either HCN or HNC, are computed. From vibrational levels of above about 2 eV internal energy, the cascade of decays leads to formation of HCN and HNC, with a ratio of 20 in favor of the former, almost independent of the precise initial vibrational state. It is only for starting levels around or slightly below the saddle point separating the HCN and HNC potential wells that the outcome depends strongly on the initial vibrational state. The consequence for interstellar molecular clouds is that the ratio (HCN)/(HNC) is predicted to be 20.

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