On the temperature dependence of the frequency of intermolecular vibrations in liquids

A new approach to the treatment of low-frequency vibrational spectra of liquids, which is being developed by the authors on the basis of concepts of variation of the effective radius of interaction during intermolecular vibrations, is used for interpretation of data on the temperature dependence of the position of these spectra. Using two polar organic liquids, chloroform and chlorobenzene, as an example, calculated values of spectral shifts of intermolecular-vibration bands in the temperature range from 300 to 483 K are shown to be in reasonably good agreement with experiments. The authors feel that the approach under investigation holds promise for deriving direct information on the analytic form of the total interaction potential in a liquid from low-frequency vibrational spectra. 11 refs., 2 tabs