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Publication
Physical Review Letters
Paper
Observation of coupled acoustic-phonon-reorientation modes in a plastic crystal: Succinonitrile
Abstract
Rayleigh-Brillouin measurements of depolarized light scattering in the plastic phase of succinonitrile are reported as a function of crystal orientation. The Rayleigh wing is characterized by two distinct molecular-reorientation modes and strongly angular-dependent shear-wave peaks are seen with typical resonance line shapes. These spectra are understood as arising from coupling between acoustic phonons and reorientation modes. Excellent agreement with a hydrodynamic description of the coupled modes is obtained. © 1975 The American Physical Society.