Raman spectra of crystals in the proton glass state

Abstract

Polarized Raman spectra of (PCHS) single crystals were measured in the frequency range at 20 - 300 K, i.e. both below and above the glass transition temperature . The evolution of the spectra with decreasing temperature indicates that the orientational disorder of ions and molecules changes at from the dynamical to a static one. A scenario for the glass transition and a model of the resulting glass state is suggested, in which the water molecules (H bonds) play the role of binding constituents of the isolated sulphate complexes .