Possible parents for the cometary CN radical - Photochemistry and excitation conditions

Details Possible parents for the cometary CN radical - Photochemistry and excitation conditions Possible parents for the cometary CN radical - Photochemistry and excitation conditions

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...151...90b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 151, no. 1, Oct. 1985, p. 90-100.

Astronomy and Astrophysics

Astronomy

57

Abundance, Cometary Atmospheres, Cosmochemistry, Cyanides, Infrared Spectra, Molecular Excitation, Photodissociation, Acetonitrile, Cyanoacetylene, Fluorescence, Free Radicals, Halley'S Comet, Millimeter Waves, Molecular Rotation, Molecular Spectra, Radio Spectra, Comets, Parent Molecules, Photochemistry, Cyanide, Atmosphere, Ejection, Velocity, Photodissociation, Distribution, Models, Telescope Methods, Hydrodynamics, Fluoresence, Intensity, Infrared, Wavelengths, Astronomy, Observations, Radio Methods

Scientific paper

In order to determine which parent molecule could be responsible for the production of the CN radical observed in cometary atmospheres, the authors review the photochemical properties of the HCN, C2N2, HC3N, and CH3CN molecules. They derive new lifetimes for HCN, C2N2, and CH3CN and try to derive the ejection velocity of CN at photodissociation for the four candidate molecules. In a second part, the authors study the excitation conditions of the four candidate parent molecules: vibrational excitation and fluorescence, as well as the rotational population distribution, are evaluated. Line and band intensities are estimated for a bright comet such as Halley. In an appendix rotational population distribution of linear molecules at fluorescence equilibrium is presented.

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