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Light scattering experiments are performed concerning polaritons associated with the anomalous TO‐doublet in CuCl. A quantitative description of the dispersion behaviour, recorded at liquid N2 temperature, may be obtained by taking into account coupling of the fundamental zone centered TO‐phonon with second order modes due to two van Hove singularities. This description is in good agreement with recent calculations of the two‐phonon density of states in CuCl.
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FUKUSHI et al. (1978) studied this question.
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