Physics – Atomic Physics
Scientific paper
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.
Ballagh Robert J.
Burnett Keith
Cooper Joshua
Hummer David G.
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