Abstract
The real-time Brillouin scattering study using a nonscanning Fabry-Perot interferometer (NSFPI) is reported on the acoustic properties of glass-forming tripropylene glycol monomethyl ether (TPGME). Due to the very short acquisition time of NSFPI, Brillouin spectra of TPGME from liquid to glassy phases have been successfully measured within 4 h, which is much shorter than that of conventional scanning-type Fabry-Perot interferometers. The deviation of the sound velocity from the low-frequency limiting value and the increase of the central peak intensity in addition to the Brillouin linewidth indicate a coupling of some structural relaxation to the acoustic waves. Based on a simple Debye approximation, it was shown that the relaxation process probed by Brillouin scattering obeys the Arrhenius law with an activation energy of about 3.1 kcal/mol and a pre-exponential factor of 5.9×10 −14 s.
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