Abstract

An ideal three-mode model is proposed which consists of two types of stochastic motions, nontrapped and trapped dynamics, and an oscillation to explain the characteristics of the dynamical behavior of supercooled liquids. The intermediate scattering function and the generalized susceptibility are obtained to show this model reproduces the dynamical characteristics of supercooled liquids. The Cole-Cole plot of the susceptibility shows two-semi circles with a shoulder in the negative side of the real axis. The non-Gaussian parameter is shown to have two peaks due to the contribution of the oscillatory motion.

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