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• W2008276159 abstract "The coupling model, based on fundamental properties of nonintegrable Hamiltonian systems (chaos), captures one important aspect of the many-body relaxation dynamics, namely the existence of a temperature insensitive crossover time, tc, when in its neighbourhood the fast independent relaxation of an individual unit at earlier times is slowed down to become the cooperative and dynamically heterogeneous relaxation at longer times. For molecular systems, tc is of the order of a picosecond and thus the coupling model bridges relaxation dynamics at microscopic times to that at macroscopic times. One result, which relates the slowed-down cooperative relaxation time to the independent relaxation time of an individual unit, has spawned many applications. A nonlinearly coupled arrays of oscillators model, which has all the features of the coupling model, is further exploited to show that the strength of intermolecular interaction determines the nonexponentiality and fragility of the long-time dynamics of glass-formers. A related model is invoked to consider the relaxation of the (precursor) vibration attempting the structural relaxation. The fast relaxation that originates from such vibrational relaxation is shown to be a plausible cause of the susceptibility minimum seen in dielectric relaxation, light and neutron scattering experiments. The model predicts that the degree of nonexponentiality of the structural relaxation is correlated with the strength of the fast precursor vibrational relaxation, in agreement with experimental observation." @default.
• W2008276159 created "2016-06-24" @default.
• W2008276159 creator A5050513971 @default.
• W2008276159 date "2000-07-06" @default.
• W2008276159 modified "2023-10-14" @default.
• W2008276159 title "Short-time and long-time relaxation dynamics of glass-forming substances: a coupling model perspective" @default.
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• W2008276159 doi "https://doi.org/10.1088/0953-8984/12/29/316" @default.
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