On redistribution and the equations for radiative transfer

Details On redistribution and the equations for radiative transfer On redistribution and the equations for radiative transfer

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...260..299c&link_type=abstract

Astrophysical Journal, Part 1, vol. 260, Sept. 1, 1982, p. 299-316. Research supported by the National Bureau of Standards, NSF

Physics

Atomic Physics

39

Astronomical Spectroscopy, Astrophysics, Atomic Physics, Equilibrium Equations, Line Spectra, Radiative Transfer, Absorptivity, Emission

Scientific paper

The derivation of the equations of statistical equilibrium are outlined, starting from the quantum density-matrix equations, drawing particular attention to the approximations and assumptions used in the development of tractable expressions. Then, using the quantum-fluctuation-regression theorem, emission and absorption coefficients are obtained for multilevel atomic systems which are nondegenerate except for m-substates. These coefficients are valid to first order in the incident intensity. Possible extensions to higher intensity broadband incoherent fields are suggested.

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