Impulsive stimulated light scattered from glass-forming liquids. II. Salol relaxation dynamics, nonergodicity parameter, and testing of mode coupling theory
- 8 November 1995
- journal article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 103 (18) , 7732-7739
- https://doi.org/10.1063/1.470294
Abstract
Impulsive stimulated light scattering was used to investigate structural relaxation dynamics of the organic glass-former salol. Relaxation dynamics on ns–ms time scales are monitored in the 238.7–280.5 K temperature range and found to be described well by the Kohlrausch–Williams–Watts relaxation function. The nonergodicity parameter fq of mode-coupling theory (MCT) in the limit of the small wave vector q is evaluated. Its temperature dependence shows a square-root cusp at a crossover temperature of Tc=266 K, consistent with neutron scattering measurements at high q and with light scattering results. This supports the MCT prediction of a cusp in fq(T) at a q-independent temperature.This publication has 25 references indexed in Scilit:
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