We have observed resonant Brillouin scattering by TA phonons near the A exciton of CdS in a usually forbidden backscattering configuration. This effect, attributed to electron-phonon piezoelectric coupling, is equivalent to the Fr\"ohlich-interaction-induced forbidden LO scattering. A numerical estimate of the scattering strength of the forbidden TA scattering accounts for the intensity of the observed lines.
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Winterling et al. (1977) studied this question.
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