The angular dependence of partially redistributed resonance radiation

Details The angular dependence of partially redistributed resonance radiation The angular dependence of partially redistributed resonance radiation

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...213..479b&link_type=abstract

Astrophysical Journal, Part 1, vol. 213, Apr. 15, 1977, p. 479-491.

Astronomy and Astrophysics

Astrophysics

34

Angular Distribution, Atomic Spectra, Frequency Distribution, Radiative Transfer, Resonance Scattering, Circular Polarization, Electron Transitions, Incident Radiation, Polarization Characteristics, Quantum Theory, Spectral Line Width

Scientific paper

Explicit expressions for the angular distribution and frequency dependence of radiation scattered by a spatially degenerate atom undergoing collisions are derived using a previously developed formalism of the quantum theory of line broadening for an atom in its rest frame. Results valid in the impact regime for resonant scattering are presented for the cases of linear incident and scattered polarization circular incident and linear scattered polarization, and unpolarized incident radiation with no monitoring of the scattered polarization. These results relate to scattering involving a j - j + or - 1 - j atomic transition, with lower-state interactions neglected; the expressions obtained take a relatively simple form involving atomic multipolar relaxation rates of the order of k = 0 and k = 2. The angular distributions for each case are combined with the frequency dependences to yield a three-component frequency redistribution function for an s-p-s transition, the components being a coherent term, a frequency-redistributed term with the same angular dependence as the coherent term, and an isotropic frequency-redistributed term.

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