The atomic generalized redistribution functions for three-photon processes, derived in the previous paper of this series, are formulated in terms of linear superpositions of newly introduced auxiliary functions qI-qVI, thus extending the traditional formalism of redistribution functions for two-photon processes. The corresponding velocity-averaged laboratory functions QI-QVI of these auxiliary functions are derived in both their angle-dependent and angle-averaged forms. Since the expressions found for QI-QVI are quite complicated, the so-called disentangled approximation is employed that uses the representative values of the generalized redistribution function at an orthogonal triad of photon directions rather than the angle-averaged function itself. This approximation yields relatively simple expressions which can be used in radiative transfer calculations.
|Number of pages
|Journal of Quantitative Spectroscopy and Radiative Transfer
|Published - Apr 1987
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics