Abstract
view Abstract Citations (9) References (12) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Maser Line Widths Elitzur, Moshe Abstract The frequency distribution of maser radiation must follow the shape of the thermal line profile when the interaction rate with the maser radiation exceeds all other rates because of rather general considerations. Goldreich and Kwan pointed out that the broadening to thermal shape from the narrow unsaturated profile need not coincide with the onset of saturation when molecules are transferred from line wings to center without affecting the overall population of each maser level. The specific mechanism they proposed involves frequency redistribution when photons ae trapped in optically thick transitions between the maser system and other levels. The same effect is also produced by elastic collisions, which are always present. This Letter shows how to include the elastic collisions and derives the relevant frequency-dependent expression for the absorption coefficient. The method developed is then utilized to incorporate the photon scattering mechanism, which inherently involves other levels, into the phenomenological two-level maser model. Publication: The Astrophysical Journal Pub Date: February 1990 DOI: 10.1086/185657 Bibcode: 1990ApJ...350L..17E Keywords: Interstellar Masers; Line Spectra; Spectral Energy Distribution; Spectral Line Width; Bandwidth; Electron Transitions; Light Scattering; Optical Thickness; Astrophysics; LINE FORMATION; MASERS full text sources ADS |
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