An optical measurement of the population inversion of the ground state Lambda doublet of interstellar CH

Details An optical measurement of the population inversion of the ground state Lambda doublet of interstellar CH An optical measurement of the population inversion of the ground state Lambda doublet of interstellar CH

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...294..238j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 294, July 1, 1985, p. 238-241. NASA-NSF-supported research.

Astronomy and Astrophysics

Astrophysics

25

Astronomical Spectroscopy, Ground Stations, Hydrocarbons, Interstellar Matter, Population Inversion, Centimeter Waves, Signal To Noise Ratios, Spectral Line Width

Scientific paper

We have performed very high signal-to-noise ratio optical observations of interstellar CH toward three stars and have measured an inversion temperature of -1.30 ± 0.4 K for the ground-state Λ doublet levels leading to the 9 cm radio emission of CH toward ζ Per. This result is consistent with the inversion indicated by the radio measurements in this direction.

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