Raman Scattering Studies in Liquids and Glasses. II. Liquid and Supercooled Liquid Glycerol

Abstract

The Raman scattering technique was used to investigate the temperature dependence of the low frequency (10–250 cm⁻¹) intermolecular spectrum in liquid and supercooled liquid glycerol. The Raman spectra, both polarized and depolarized, were interpreted by using a relationship connecting the Raman scattering spectral density to the imaginary dielectric susceptibility. The imaginary dielectric susceptibility function was then calculated by a damped harmonic oscillator model. Within the framework of this model, the temperature dependent behavior of the characteristic oscillator frequency, damping constant, and static susceptibility were obtained and interpreted as arising from the hydrogen bond motion existing in the glycerol system. The intermolecular Raman and the thermal neutron scattering results have been found to be supplementary and have both led to a consistent description of the various low frequency motions in the liquid and supercooled liquid glycerol as influenced by the temperature sensitive hydrogen bonding.