An investigation of quasi-elastic light scattering by hopping particles is made on the basis of the relaxation mode theory. The prediction by Klein that the scattering cross section gives a nonzero value at zero wave-vector transfer when the polarizability depends on lattice site is confirmed in a sublattice system. The depolarized scattering, found in some superionic conductors, is also discussed in terms of the polarizability fluctuation of pairs of mobile and adjacent deformed immobile ions.
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Tadao Ishii (1990) studied this question.
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