Abstract
Brillouin scattering of Trimethylene Glycol which often crystallizes on slow cooling was measured from 197 K to 426 K using the angular dispersion-type Fabry-Perot interferometer with a CCD detector. Especially the Brillouin spectra on the cooling from 300 K to 197 K could be observed only in 1.5 h without crystallization. The observed sound velocity and anomalous attenuation are analyzed by a single relaxation model. The relaxation frequency obeys the Arrhenius law with an activation energy of 3.71 kcal/mol. This suggests that the observed sound anomaly is due to the fast β-relaxation process.
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