Absorption and emission line profile coefficients of multilevel atoms. I - Atomic profile coefficients. II Velocity-averaged profile coefficients

Details Absorption and emission line profile coefficients of multilevel atoms. I - Atomic profile coefficients. II Velocity-averaged profile coefficients Absorption and emission line profile coefficients of multilevel atoms. I - Atomic profile coefficients. II Velocity-averaged profile coefficients

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jqsrt..29..477h&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer (ISSN 0022-4073), vol. 29, June 1983, p. 477-493, 495-506.

Physics

Plasma Physics

20

Absorption Spectra, Atomic Energy Levels, Emission Spectra, Line Spectra, Radiative Transfer, Stimulated Emission, Atomic Excitations, Atomic Spectra, Distribution Functions, Elastic Scattering, Kinetic Equations, Thermodynamic Equilibrium, Velocity Distribution

Scientific paper

The line profile coefficients of a gas of multilevel atoms are discussed, using a semiclassical model in which atoms are always in one of their energy eigenstates and have a distinct velocity distribution at a particular energy level. Generalized redistribution functions for the consecutive radiative transitions of a multilevel atom are defined and used to determine atomic profile coefficients for absorption and emission; stimulated emission, nonlocal effects, and elastic collisions with excited atoms are taken into account. The velocity distribution of excited atoms is approximated for two-level and three-level atoms from the specific intensity of the local radiation field, by assuming a Maxwellian distribution in the ground state and ignoring streaming and stimulated emission. Velocity-aeraged profile coefficients are derived. This simplified model is shown to elucidate the interaction of atomic and kinetic factors, and to describe satisfactorily the spectroscopic state of a gas in a chaotic radiation field, as typically found in plasma physics and astrophysics.

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