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2002:
Arbe A; Colmenero J; Alvarez F; Monkenbusch M; Richter D; Farago B; Frick B
Non-Gaussian nature of the alpha relaxation of glass-forming polyisoprene.
Physical review letters 2002;
89(
24):.
We 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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