Abstract
The polarization properties of longitudinal optical (LO) phonon overtones were investigated for resonance Raman scattering (RRS) in CdS. The experimental results indicate that the polarization of LO phonon overtones is strongly correlated with the intermediate electronic states which resonate with the scattered light energy. Temperature dependent polarization properties of Raman lines were observed and these results lead to a conclusion that RRS should be considered as inelastic scattering of polaritons by LO phonons. When the laser light excited the energy region a little lower the A -exciton resonance energy E T plus an integer times LO phonon energy \(n\hbar\omega_{\text{LO}}\), zero-phonon A -exciton emission, the Raman line and the hot A -exciton emission were simultaneously observed.
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