Abstract
Abstract Directional dispersion of the highest frequency B-phonon branch associated with the ω3-vibration of H2O in monoclinic Li2SO4·H2O has been measured by means of Raman spectroscopy for varying wave vector directions perpendicularly to the twofold symmetry axis. The minimum and maximum frequency indicates those directions for which there exist purely transverse and longitudinal waves, respectively. Since the dipole moment of the ω3-vibration is parallel to the H-H-direction the wave normals of the TO- and LO-modes allow a direct conclusion in regard to the orientation of the crystal water molecules. Our result is in good agreement with previous NMR-measurements.
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