A search for 2Pi, N = 1, J = 3/2 Lambda-doubling transitions of CH

Details A search for 2Pi, N = 1, J = 3/2 Lambda-doubling transitions of CH A search for 2Pi, N = 1, J = 3/2 Lambda-doubling transitions of CH

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...275..175z&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 275, Dec. 1, 1983, p. 175-180.

Astronomy and Astrophysics

Astronomy

4

Hydrocarbons, Hyperfine Structure, Molecular Clouds, Molecular Excitation, Radio Sources (Astronomy), Gas Density, Interstellar Masers, Molecular Spectra, Optical Thickness, Supernova Remnants

Scientific paper

The authors report negative results for a search for the 2Π, N = 1, J = 3/2 Λ-doubling transition of the CH molecule. Upper limits to the column densities calculated from these observations are in agreement with those previously derived from the 3 GHz ground-state transitions, provided that the excitation temperature within the Λ-doublet is ⪉100 - 700K. Toward Cas A, Ori A, and Sgr B2, upper limits to the optical depth for the transition are an order of magnitude lower than those obtained from the ground-state measurements.

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