Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...218..677e&link_type=abstract
Astrophysical Journal, Part 1, vol. 218, Dec. 15, 1977, p. 677-686.
Astronomy and Astrophysics
Astronomy
11
Ground State, Hydrocarbons, Interstellar Chemistry, Molecular Excitation, Angular Momentum, Cloud Physics, Microwave Emission, Molecular Spectra, Radio Sources (Astronomy)
Scientific paper
Gwinn and Townes (1968) have conjectured a collision mechanism whereby a certain half of a Lambda-doublet will be more strongly excited during rotational excitation of an open-shell diatomic molecule from the ground state. This paper assumes that the Gwinn-Townes conjecture is valid. Certain matrix elements of the scalar product between the angular momentum of a molecule's end-over-end rotation and its electrons' orbital angular momentum perpendicular to their plane of motion are calculated, and the preferred states corresponding to a specific spatial orientation of the molecule's cloud of valence electrons are identified. The results are used to derive the level populations of CH in model-cloud calculations and to investigate systematically the regions of physical parameters which yield the observed inversion of the ground state of CH. Effects of near-IR and UV pumps in the case of CH are briefly considered along with line-overlap effects.
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