Infrared pumping of OH main lines

Details Infrared pumping of OH main lines Infrared pumping of OH main lines

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....81....1b&link_type=abstract

Astronomy and Astrophysics, vol. 81, no. 1-2, Jan. 1980, p. 1-7.

Astronomy and Astrophysics

Astronomy

28

Hydroxyl Emission, Infrared Astronomy, Interstellar Masers, Stellar Spectra, Variable Stars, Dipoles, Far Infrared Radiation, Mira Variables, Optical Thickness, Radiative Transfer, Stellar Models

Scientific paper

Recently published A-values for OH rotational transitions exhibit relatively large differences (several percent for some transitions of astrophysical interest) between 'image' transitions (corresponding to parity changes inside the rotational states). These differences are essentially due to asymmetries in dipole matrix elements. In the presence of far infrared radiation the ground state main lines can be inverted. The competing effects of different infrared transitions in the inversion process are analyzed and it is shown that a significant excitation of the 2Pi 1/2 J equals 5/2 level is required for the inversion of the 18 cm main lines and that the asymmetries of the dipole matrix elements dominate the effects of frequency differences. This mechanism can account for the OH emission from Mira variables and OH-IR sources.

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