Physics
Scientific paper
Jan 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apphy...9....1k&link_type=abstract
Applied Physics, vol. 9, Jan. 1976, p. 1-10. Research supported by the Deutsche Forschungsgemeinschaft.
Physics
2
Electron Pumping, Interstellar Masers, Interstellar Matter, Maser Outputs, Optical Pumping, Radiative Transfer, Absorptivity, Chemical Energy, Hydroxyl Radicals, Line Spectra, Population Inversion, Saturation, Silicon Oxides, Water
Scientific paper
This paper represents a brief review on some properties of cosmic masers, in particular on OH, H2O, and SiO sources. Emphasis is given to problems of radiative transfer in the maser line as well as in other lines of the masing molecules. The importance of these effects is an essential difference to laboratory lasers. - Differences and similarities between the radiative properties of cosmic masers and other (NLTE) sources of line emission having no population inversion are pointed out. Various pumping mechanisms suggested for the interpretation of the observations are summarized.
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