One‐Phonon Resonance Raman Scattering

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Abstract
Indirect creation and annihilation probabilities for a Wannier‐Mott exciton with arbitrary kinetic energy and interacting with longitudinal optical (LO) phonons are obtained as a function of temperature. These results are applied to the calculation of the one‐phonon (Stokes and anti‐Stokes) resonance Raman scattering (RRS) cross‐section in the case when the intermediate states are considered to be hot excitons, interacting with the LO‐phonons. The scattering cross‐section of these processes in CdS at 77, 150, and 300 K are presented as a function of the incident radiation frequency. It is shown that the cross‐section calculated for high temperatures and for incident radiation energies larger than the energy gap is dominant with respect to the cross‐section corresponding to processes in which only one phonon participates (no indirect transition).