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A sensitive Rayleigh-scattering technique has been developed which combines the advantages of stimulated and classical scattering. Forward Rayleigh scattering (3-mrad angular separation) in NaF was observed between 300 and 20^∘{}K. The scattered intensity varies by more than 4 orders of magnitude within this temperature interval. Quantitative agreement with theoretical values based on the Landau-Placzek theory is found for T>80^∘K. Scattering rates considerably larger than expected are found for lower temperatures.
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Pohl et al. (1973) studied this question.
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