Abstract
It has been reported that the line shape of the broad central component observed in light scattering spectra in KD 2 PO 4 depends upon the direction of scattering wave vector q near the transition temperature. The spectra in this system have been shown to be well described as those of a polarization relaxation mode-acoustic phonon coupled system with two special directions of q . By substituting experimental data for the parameters in this system, the temperature and q dependences of the spectra are numerically computed. The observed q dependence is well simulated by taking into account the anisotropic polarization fluctuations due to an electrostatic dipole-dipole interaction and an elastic long range force.
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