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      Reorientational relaxation of a linear probe molecule in a simple glassy liquid

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          Abstract

          Within the mode-coupling theory (MCT) for the evolution of structural relaxation in glass-forming liquids, correlation functions and susceptibility spectra are calculated characterizing the rotational dynamics of a top-down symmetric dumbbell molecule, consisting of two fused hard spheres immersed in a hard-sphere system. It is found that for sufficiently large dumbbell elongations, the dynamics of the probe molecule follows the same universal glass-transition scenario as known from the MCT results of simple liquids. The \(\alpha\)-relaxation process of the angular-index-j=1 response is stronger, slower and less stretched than the one for j=2, in qualitative agreement with results found by dielectric-loss and depolarized-light-scattering spectroscopy for some supercooled liquids. For sufficiently small elongations, the reorientational relaxation occurs via large-angle flips, and the standard scenario for the glass-transition dynamics is modified for odd-j responses due to precursor phenomena of a nearby type-A MCT transition. In this case, a major part of the relaxation outside the transient regime is described qualitatively by the \(\beta\)-relaxation scaling laws, while the \(\alpha\)-relaxation scaling law is strongly disturbed.

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          Dynamics of supercooled liquids and the glass transition

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            Dynamical model of the liquid-glass transition

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              Supercooled water and the kinetic glass transition

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                Author and article information

                Journal
                22 March 2000
                Article
                10.1103/PhysRevE.61.6934
                cond-mat/0003359
                c73924db-e041-4b1f-a089-963ceca273df
                History
                Custom metadata
                40 pages. 10 figures as GIF-files, to be published in Phys. Rev. E
                cond-mat.soft

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