A comprehensive light scattering study of the glass former toluene

We present depolarized light scattering data of the glass former toluene as obtained from tandem Fabry–Perot interferometry and Raman scattering covering a frequency range 0.5 GHz<v<5000 GHz. A large temperature interval of the (supercooled) liquid (Tg=117 K<T<295 K) as well as of the glass (7 K<T<117 K) is measured. Testing the scaling laws of idealized mode coupling theory (MCT) we find that MCT provides a satisfying interpolation up to the fluid regime (T/Tg=2.5) and a critical temperature Tc≅153 K is extracted. Deviations from the high-temperature MCT laws below Tc can be identified by constructing a master curve for the α-process. The deviations are attributed to spectral contributions from the high-frequency wing of the α-process and/or of the slow β-process which appear apparently only below Tc. A comparison with dielectric spectroscopy data, exhibiting a strong β-process, confirms this. Furthermore, we carry out a phenomenological analysis which assumes additivity of the susceptibility of α-proces...

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