A theory of secondary radiation in semiconductors is presented. The general expression for the differential cross‐section is derived which in the corresponding limiting cases describes off‐resonant light scattering and luminescence and is valid in resonance conditions. The theory developed is applied to the analysis of two‐phonon resonant Raman scattering by longitudinal optical phonons. It is shown that in this case the secondary radiation contains an additional contribution arising from quantum interference, comparable with the main contribution. The additional contribution may lead to a peculiarity of the radiation angular distribution in the backscattering direction.
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Ivchenko et al. (1978) studied this question.
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