Hyperfine selective collisional excitation of interstellar molecules

Details Hyperfine selective collisional excitation of interstellar molecules Hyperfine selective collisional excitation of interstellar molecules

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...144....1s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 144, no. 1, March 1985, p. 1-12. Sponsorship: Deutsche Forschungsgemeinschaft.

Astronomy and Astrophysics

Astronomy

23

Hyperfine Structure, Molecular Clouds, Molecular Collisions, Molecular Excitation, Molecular Spectra, Radio Sources (Astronomy), Ammonia, Collision Rates, Hydrocyanic Acid, Molecular Theory, Radiative Transfer, Scattering Cross Sections

Scientific paper

The hyperfine selective collisional excitation of linear rotor and symmetric top molecules is discussed in detail and it is shown that the commonly used, simpler approximations for handling the hyperfine selective collisional excitation are not sufficient. The scattering process is described in the framework of formal scattering theory, which also allows for a concise derivation of the coupled states and infinite order sudden approximations. Numerical results are given for the scattering of para-NH3/He and HCN/He. The correct description of the hyperfine selective collisional excitation is important for the interpretation of radioastronomical observations of these molecules, which show that the hyperfine states are not thermally populated in many molecular clouds.

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