Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jqsrt..58..887s&link_type=abstract
Journal of Quantitative Spectroscopy and Radiative Transfer, Vol. 58, No. 4 - 6, p. 887 - 903
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2
Radiative Transfer: Plasma, Radiative Transfer: Resonance Lines
Scientific paper
The theory of resonance radiation transfer in highly absorptive media is developed. The system of equations for generalized spectral "intensity" of radiation and population densities of excited states is obtained. The generalized "intensity" depends on frequency and wave number which are independent variables, and obeys simultaneously two equations. One of them has the form of a kinetic equation and the other one the form of a wave equation with a source in right hand side. The observable spectral intensity of radiation can be obtained from the generalized one by the proper integration over wave numbers; inside thick media it may be significantly higher than Planck intensity. The boundary conditions for the "intensity" are deduced and for inhomogeneous media it is shown that the residual intensity at the output of hot matter may be several orders of magnitude higher than according to the conventional theory. For optically thick media the spatial distribution of the excited atoms can be received with high accuracy from the well known Biberman-Holstein equations. A numerical code for solution of the proposed equations is developed and the results of simulations are compared with the experimental ones carried out with sodium vapour. The agreement with experiment is quite satisfactory. The possibility to observe the predicted effects in plasmas of multicharged ions is discussed.
Chekhov Dmitriy I.
Leonov Alexei G.
Sechin Andrey Yu.
Starostin Andrei N.
Zemtsov Yu. K.
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