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- W1989436036 abstract "In an incoherent quasielastic neutron scattering experiment on the binary system H2Ar, the diffusive dynamics of a light tagged particle in a matrix of heavy scatterers have been studied. The hydrogen-argon mixture well represents the Lorentz model of molecular dynamics. This simple model, although established long ago, has become tractable theoretically only recently owing to the development of mode-coupling techniques in the theory of dense many-particle systems. According to recent theoretical results on the Lorentz gas for non-overlapping hard spheres, the diffusion of the light species is found to be suppressed significantly below the Enskog value, DE, at increased η, the packing fraction of the scatterers. A density scan of the reduced diffusion coefficient D/DE measured at constant temperature indicates a diffusion localization transition in the system. The critical density is extrapolated to ηc=0.30 in agreement with mode-coupling results for the H2Ar Lorentz model." @default.
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- W1989436036 date "1993-05-01" @default.
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- W1989436036 title "Suppression of diffusion in the Lorentz gas" @default.
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- W1989436036 doi "https://doi.org/10.1016/0022-3093(93)90164-s" @default.
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