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According to the coupling model of relaxation, structural relaxation in glass-forming liquids is comprised of an intermolecularly uncorrelated step (“fast α-relaxation process”) in the picosecond time range followed by a slowed, intermolecularly cooperative, “slow α” process. Molecular dynamics simulation data [Sindzingre, P.; Klein, M. J. Chem. Phys. 1992, 96, 4681] have shown that for the “strong” liquid methanol, the fast relaxation step is absent. This finding is in contrast to the prominent fast relaxation appearing in fragile liquids about the glass transition temperature. The differing behavior of methanol can be accounted for from an analysis of the self part of the intermediate scattering function, FS(k,t) according to the coupling model. The latter relates the magnitude of the fast α-relaxation to the relaxation time, τ*, and to the exponent β of the slow α-process described by the stretched exponential function exp[−(t/τ*)β]. This function fits the experimental FS(k,t) for t longer than 2 ps. T...

Short-Time Relaxational Dynamics of the “Strong” Glass-Former Methanol