Depolarized light scattering from shear wave in a viscoelastic liquid: α-phenyl o-cresol

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Abstract
Polarized and depolarized Rayleigh–Brillouin spectra of α-phenyl o-cresol are studied as a function of temperature and scattering angle. The frequency of the longitudinal wave as measured in the polarized spectra displays kinks at the glass transition temperature and at 325 K (TK). TK is above the melting temperature. The shear wave frequency increases linearly with decreasing temperature below TK and is vanishingly small above TK. Over the temperature region that the shear wave can be resolved, the shear wave frequency is proportional to q and the linewidth is proportional to q2. Comparison of the experimental results with the available theory is provided.