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Relaxation of a molecular glass at intermediate times

Authors
Journal
Solid State Communications
0038-1098
Publisher
Elsevier
Publication Date
Volume
86
Issue
5
Identifiers
DOI: 10.1016/0038-1098(93)90376-x

Abstract

Abstract The results of a detailed molecular-dynamics investigation of relaxation in the van der Waals system o-terphenyl are presented. Our calculations give evidence for the existence of a fast process on the picosecond timescale. This confirms the neutron-scattering observation of an anomalous decrease of the Debye-Waller factor, predicted by mode-coupling theory, and reconciles it with the temperature-independent process with a 3 ps relaxation time observed in light-scattering experiments. We demonstrate that this process results from the strongly anharmonic motion of molecules trapped in the cages formed by their neighbours.

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