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000024202 0247_ $$2DOI$$a10.1103/PhysRevLett.89.245701
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000024202 084__ $$2WoS$$aPhysics, Multidisciplinary
000024202 1001_ $$0P:(DE-HGF)0$$aArbe, A.$$b0
000024202 245__ $$aNon-Gaussian nature of the alpha-relaxation of glass-forming polyisoprene
000024202 260__ $$aCollege Park, Md.$$bAPS$$c2002
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000024202 520__ $$aWe report quasielastic neutron scattering experiments exploring the alpha relaxation in polyisoprene over an unprecedented range in momentum transfer. Corroborating and validating earlier molecular dynamics simulations, the measurements reveal a crossover from a Gaussian regime of sublinear diffusion to a strongly non-Gaussian regime at short distances. We show that a consistent interpretation in terms of a distribution of finite jumps underlying the alpha process is possible. This model leads to a time-dependent non-Gaussian parameter exhibiting all features revealed so far from various simulations.
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000024202 7001_ $$0P:(DE-HGF)0$$aColmenero, J.$$b1
000024202 7001_ $$0P:(DE-HGF)0$$aAlvarez, F.$$b2
000024202 7001_ $$0P:(DE-Juel1)VDB2684$$aMonkenbusch, M.$$b3$$uFZJ
000024202 7001_ $$0P:(DE-Juel1)130917$$aRichter, D.$$b4$$uFZJ
000024202 7001_ $$0P:(DE-HGF)0$$aFarago, B.$$b5
000024202 7001_ $$0P:(DE-HGF)0$$aFrick, K. H.$$b6
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