The infrared reflection spectra of Tris-sarcosine calcium chloride-bromide and the Raman spectra have been obtained for T < Tc in the polarization E//Y or y, z(yy)y, z. One nonpolar Raman active and two weakly polar infrared active soft modes have been observed. These soft modes are interpreted by the coupling of low lying optical modes with a fast relaxator in a phase transition of prevalent order-disorder type.
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Chen et al. (1984) studied this question.
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