Journal Article

PreJuSER-24202

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Non-Gaussian nature of the alpha-relaxation of glass-forming polyisoprene

Arbe, A. ; Colmenero, J. ; Alvarez, F. ; Monkenbusch, M.FZJ* ; Richter, D.FZJ* ; Farago, B. ; Frick, K. H.

2002
APS College Park, Md.

This record in other databases:    

Please use a persistent id in citations: http://hdl.handle.net/2128/1277  doi:10.1103/PhysRevLett.89.245701

Abstract: 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.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

---

Contributing Institute(s):

1. Neutronenstreuung (IFF-NST)

Research Program(s):

1. Kondensierte Materie (M02)

Appears in the scientific report 2002
Notes: This version is available at the following Publisher URL: http://prl.aps.org

---

Database coverage:

---