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The hydrogen motion in poly͑vinyl ethylene͒ ͑1,2-polybutadiene͒ in the ␣-relaxation regime has been studied by combining neutron spin echo ͑NSE͒ measurements on a fully protonated sample and fully atomistic molecular dynamics simulations. The almost perfect agreement between experiment and simulation results validates the simulated cell. A crossover from Gaussian to non-Gaussian behavior is observed for the intermediate scattering function obtained from both NSE measurements and simulations.doi:10.1063/1.1772761 pmid:15291640 fatcat:4owm434dazeclo4qbzwlhrbpwu