Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985baicz..36....1h&link_type=abstract
Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 36, Jan. 1985, p. 1-9.
Astronomy and Astrophysics
Astrophysics
18
Astrophysics, Atomic Energy Levels, Atomic Spectra, Emission Spectra, Line Spectra, Radiative Transfer, Approximation, Distribution Functions, Iterative Solution, Stimulated Emission
Scientific paper
A formulation of equations for radiative transfer in a gas of multilevel atoms, taking into account recent developments of theoretical description, is presented. It is shown that for a simple case where one chosen transition is allowed to depart from complete redistribution, the global multilevel problem may be solved by suitably modified complete-redistribution numerical techniques. In particular, the author has formulated a modification of the equivalent-two-level-atom approach that enables a multilevel transfer to be solved by a simple iteration scheme. Various approximate forms of the line source function are also discussed.
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