We have performed experiments to show the resonant enhancement of the forbidden first-order LO mode at the E₀+Δ₀ gap of pure CdTe at 17 K. We explain this forbidden scattering in terms of intrinsic intraband Fr\"ohlich interaction. In our experiments we also observe multiple-LO-phonon scattering up to four orders under both incoming and outgoing resonant conditions. The multiphonon spectra are briefly discussed and compared with other cadmium chalcogenides.
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Islam et al. (1992) studied this question.
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