The concept of the redistribution function, which was originally introduced in order to describe a correlation between frequencies and directions of the absorbed and emitted photon in resonance scattering, has been extended to other resonance two-photon processes including resonance Raman scattering, resonance two-photon absorption and emission, and inverse Raman scattering. We have derived, within the frame of the impact approximation, the appropriate form of the generalized redistribution function. Using a suitable formalism, the generalized redistribution function takes the same form for all types of two-photon processes and contains all the redistribution functions, considered previously, as various limiting cases. In analogy to Hummer's original scheme of redistribution functions, we have derived a similar set of generalized redistribution functions, denoted as pi(i = I, II, III, IV, V), and we have shown that the most general case is described by a linear combination of pIII and pV, analogously to the previous results. Explicit formulae for the velocity-averaged (laboratory-frame) generalized redistribution functions pi(i = I, II, III, IV, V) are given and possible numerical methods for their evaluation are briefly indicated.
|Original language||English (US)|
|Number of pages||17|
|Journal||Journal of Quantitative Spectroscopy and Radiative Transfer|
|State||Published - Jun 1982|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics