Light scattering in carbon tetrachloride: Liquid and plastic crystal phases

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Abstract
The quasielastic light scatteringspectra of carbon tetrachloride have been studied from room temperature to the solidification point and in both plastic phases, allowing measurements of the hypersound velocity and damping. Thermal relaxation effects have been observed in the liquid over the whole temperature range investigated and the spectraanalyzed according to Mountain’s theory. The evolution of the isothermal and adiabatic compressibilities was derived from relative intensity measurements. Their behavior is in good agreement with a classical thermodynamic description (down to a few degrees before solidification). In the solid phase our experiments bring new information to elucidate the phase diagram.