Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aipc..467..301s&link_type=abstract
The 14th international conference on spectral line shapes. AIP Conference Proceedings, Volume 467, pp. 301-312 (1999).
Astronomy and Astrophysics
Astrophysics
Stellar Atmospheres, Radiative Transfer, Opacity And Line Formation, Line And Band Widths, Shapes, And Shifts
Scientific paper
The review of recent achievements in the problem of resonance radiation transfer in dense highly absorptive media is presented. It is shown, in particular, that a spectral distribution of a resonance level population is proportional to exp(-ℏω/T), where ℏ is Planck constant, ω-current frequency, T-temperature. The availability of this factor can result in occurrence of the second maximum on a far-red wing of a resonant line. According to the theoretical prediction in a luminescence spectrum for sodium resonance line a maximum in the region of 2-3 micrometers must be observed. Intensity of a radiation in this maximum by some orders of magnitude exceeds the value, obtained from a standard theory of radiation transfer. This phenomenon can be conditionally named as ``infrared catastrophe.'' The experimental measurement of the spectra and radiation intensity in IR and visible regions are in the agreement with the advanced theory.
Chekhov Dmitriy I.
Leonov Alexei G.
Sechin Andrey Yu.
Starostin Andrey N.
Zemtsov Yuriy K.
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