Collisional excitation of the hyperfine transitions of HCN

Details Collisional excitation of the hyperfine transitions of HCN Collisional excitation of the hyperfine transitions of HCN

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.221p..33m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 221, Aug. 1, 1986, p. 33P-39P.

Statistics

Computation

36

Hydrocyanic Acid, Interstellar Matter, Molecular Collisions, Molecular Excitation, Collision Rates, Hydrogen Ions, Kinetic Energy, Temperature Dependence

Scientific paper

The temperature-dependent collisional-rate coefficients for HCN-He collisions are determined on the basis of full close-coupling computations and presented in tables. Specific results for T = 20 K are compared with those obtained by other (approximate) methods, and the reasons for some significant discrepancies are discussed. The implications of these collisional-rate coefficients for the interpretation of the anomalous relative intensities observed in the three hyperfine components of the j = 1-0 transitions of interstellar HCN are considered.

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