Absorption and emission line profile coefficients of multilevel atoms-IV. Velocity-averaged generalized redistribution functions for three-photon processes

I. Hubeny, J. Oxenius

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2 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)397-406
Number of pages10
JournalJournal of Quantitative Spectroscopy and Radiative Transfer
Issue number4
StatePublished - Apr 1987


ASJC Scopus subject areas

  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy

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