Temperature dependence of the Raman scattering spectrum of molten CsCl
(EN)
Raptis, C
(EN)
McGreevy, RL
(EN)
Light scattering measurements have been carried out in molten CsCl over the temperature range 945-1245 K. Assuming the molten salt system to be a quasi-harmonic oscillator, the authors have found that the integrated intensity of the spectra increases with temperature at rates that exceed those anticipated for first-order scattering. The spectral variation of the intensity shows that the excess scattering, due mainly to second-order summation or difference bands, occurs in the low-frequency region (up to 80 cm-1) and the high-frequency tail (above 150 cm-1). The average depolarization ratio rho d of the spectra remains constant with temperature, but the depolarization ratio spectrum shows that (a) rho d( nu ) increases with T up to approximately=60/sup /cm-1 and (b) decreases with T above 60 cm-1. This is explained as due to a transition of the ions that contribute most strongly to the scattering from an anisotropic environment, determined by binary collisions to a more isotropic environment determined by the average local structure.
(EN)
