Computer Science
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jqsrt..49..401s&link_type=abstract
Journal of Quantitative Spectroscopy and Radiative Transfer (ISSN 0022-4073), vol. 49, no. 4, p. 401-410.
Computer Science
1
Atomic Excitations, Gas Mixtures, Illuminance, Photons, Radiation Transport, Light Transmission, Momentum Transfer, Radiative Transfer, Resonant Frequencies, Stellar Atmospheres
Scientific paper
It has been suggested that white light-induced drift might be a mechanism for the separation of species in chemically peculiar stars. Light-induced drift velocities are calculated as a function of optical depth for two species of two level atoms in a gas mixture. Fraunhofer spectral lines form by radiative transfer as the light escapes from the optically-thick environment. Both species are assumed to be identical except for their resonant frequencies, which are separated by a small frequency displacement on the order of the Doppler width. Complete frequency redistribution is assumed. It is found that outward and inward propagating light both contribute to the light-induced drift. The outward contribution dominates near the edge of the vapor. Calculated drift velocities are about 1 m/sec at temperatures of 6000 K.
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