Redistribution of scattered radiation by collisions in the nonimpact region of the spectral line profile

Details Redistribution of scattered radiation by collisions in the nonimpact region of the spectral line profile Redistribution of scattered radiation by collisions in the nonimpact region of the spectral line profile

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...228..339c&link_type=abstract

Astrophysical Journal, Part 1, vol. 228, Feb. 15, 1979, p. 339-356.

Astronomy and Astrophysics

Astrophysics

26

Atomic Collisions, Fluorescence, Line Spectra, Radiation Distribution, Radiative Transfer, Rayleigh Scattering, Angular Distribution, Light Scattering, Quantum Theory, Raman Spectra, Spectral Signatures

Scientific paper

The scattering of radiation in the presence of collisions can be described quantum-mechanically in terms of essentially two processes. The first may be thought of as an absorption to the excited state followed subsequently (after propagating in the excited state) by emission. This gives rise to radiation redistributed about the transition frequency. The effects of m-degeneracy are particularly interesting for this first process. As an example a case is considered in which the incident frequency is in the quasi-static line wing, while the scattered frequency is close to the line center. It is found that under these circumstances the dominant contribution from this process in the scattered spectrum is obtained for an absorption of the incident frequency taking place during a strong (close) collision and reemission of the scattered frequency when the atom is essentially unperturbed

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