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Abstract
Raman scattering from single crystals of k3D(SO4)2 has been observed in both of the disurdered and ordered phases. No effect of deuteration on frequencies was found for most of the Raman lines. The internal mode V 2 splits into four peaks in the ordered phase and the temperature dependence of the splitting has an index half of that given by the mean field theory. The a.nomalous broadening of the V 2 line was found above Tc and explained successfully with the application of motional narrowing theory developed in NMR.