Main line maser emission in the OH ground state Lambda-doublet as a result of overlapping far infrared transitions

Details Main line maser emission in the OH ground state Lambda-doublet as a result of overlapping far infrared transitions Main line maser emission in the OH ground state Lambda-doublet as a result of overlapping far infrared transitions

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.178..441p&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 178, Feb. 1977, p. 441-450.

Astronomy and Astrophysics

Astronomy

13

Electron Transitions, Far Infrared Radiation, Ground State, Hydroxyl Emission, Interstellar Masers, Water Masers, Doppler Effect, Line Spectra, Population Inversion, Radiative Heat Transfer, Spectrum Analysis, Transport Properties

Scientific paper

It is noted that frequencies for some far-IR transitions in the OH spectrum may be so close together as to result in overlapping Doppler widths and that the use of standard two-level radiative-transfer theory for each of the overlapping transitions separately is therefore incorrect. A modified radiative-transfer theory is developed which allows for overlapping lines. The effect of line overlap on the source function of a given transition is examined, and it is found that the overlap effect provides amounts of radiative trapping in certain transitions ending on upper Lambda-doublet ground states which are significantly different from the amounts in related transitions ending on the lower states. Main-line population inversions in the ground-state Lambda doublet are computed for a range of incident-flux temperatures and H2 number densities. The results indicate main-line emission at 1665 and 1667 MHz as well as satellite-line emission at 1612 MHz.

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