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The coupled dynamics of translations and rotations is studied with respect to mixed molecular crystals. At high temperatures the dynamic scattering law exhibits a Brillouin doublet which softens with decreasing temperature (fast orientational relaxation regime). In diluted molecular crystals of type (KCN)c(KX)_1-c, X=ClorBr, the structural phase transition is suppressed and one reaches the slow orientational relaxation regime at low temperatures. Then the Brillouin doublet frequency passes through a minimum and increases again with decreasing temperature. At the same time a well-defined central resonance rises in the spectrum as a consequence of slowing-down orientational relaxation. The theory describes recent neutron-scattering experiments in mixtures by Rowe and Rush and recent Brillouin-scattering results by Satija and Wang.
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Michel et al. (1978) studied this question.
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