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- W2048282897 abstract "We discuss here the rapid time-dependent dynamics of the intermolecular potential in a varied class of “glassy” systems through the evaluation of the vibrational amplitude correlation, i.e. the numerical Fourier transform of the isotropic Raman profile, of an isolated and appropriate system oscillator (Linear Response Theory). We consider the stochastic fluctuations of the intermolecular potential coupling to the oscillator coordinate to represent an equilibrium renewal process that switches, “at random”, the transition frequency of the oscillator about its equilibrium value (“Vibrational Dephasing with Motional Narrowing”). We assign the stretched exponential, to give a useful and problem-related limiting description of the probability density function of the “backward recurrence time”, i.e. the time interval from time t back to the previous frequency switch, and the “forward recurrence time”, i.e. the time from t the next instant of an oscillator frequency switch. The assumed F̃(t) causes a series of switches (“events’) that are clustered at early observation times, modelling the particular, rapid dynamics of many glass-like systems in terms of “catastrophic” relaxation steps in the medium. Examples are comformational rearrangement of alkyl chains in liquid crystals, jump motion of holes in fused inorganic salts, and jump motion of water-shell molecules between ions in concentrated electrolytes. We discuss here the first and third example." @default.
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- W2048282897 date "1990-03-01" @default.
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- W2048282897 title "Picosecond dynamics in amorphous systems with local order" @default.
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- W2048282897 doi "https://doi.org/10.1016/0022-2860(90)80361-m" @default.
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