Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...107...26b&link_type=abstract
Astronomy and Astrophysics, vol. 107, no. 1, Mar. 1982, p. 26-30. Research supported by the Science Research Council.
Astronomy and Astrophysics
Astrophysics
2
Acetylene, Astronomical Models, Cyano Compounds, Hydrogen Clouds, Interstellar Matter, Molecular Collisions, Scattering Cross Sections, Approximation, Ellipsoids, Line Spectra, Molecular Spectra, Radio Frequencies
Scientific paper
An approximation calculation of rate constants for rotational transitions due to H2 in HC7N and HC9N is presented using a rigid-shell potential and classical mechanics for quantum numbers and temperatures of astrophysical interest. Corrections due to long-range forces are investigated and are found to be significant for low delta j transitions, where j is the rotational quantum number. Formulas are presented from which rate coefficients can be calculated for temperatures of 10-50 K and various values of the rotational quantum number.The approximations to the dynamics and to the potential surface are discussed along with their range of validity, and results suggest that for a relative electron number density of about one million or greater, electron collisions must be taken into account.
Bhattacharyya Sudip
Dickinson A. S.
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