On the excitation of CH microwave lines

Details On the excitation of CH microwave lines On the excitation of CH microwave lines

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...285..312b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 285, Oct. 1, 1984, p. 312-321.

Astronomy and Astrophysics

Astronomy

7

Hydrocarbons, Interstellar Matter, Microwave Spectra, Molecular Excitation, Electron Transitions, Hyperfine Structure, Line Spectra, Molecular Rotation, Radio Astronomy

Scientific paper

The characteristics of excitation of the CH 9 cm line exhibited by the interstellar medium are discussed. Attention is focused on trapping in the J = 3/2 yields 1/2 rotational transitions, which produce overexcitation of the F = 0 yields 1 inverted transition. The LVG (Sobolev) and nonlocal excitation models are shown incapable of explaining the hyperfine anomalies. Consideration of rotational line overlap, particularly in the F = 2(+) yields 1(-) and F = 1(+) yields 1(-) transitions of the 2Pi1/2 level of the J = 3/2 yields 1/2 rotational transition, supplies an effective mechanism for the observed hyperfine anomalies.

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