Vibrational origin of the fast relaxation processes in molecular glass-formers

Details Vibrational origin of the fast relaxation processes in molecular glass-formers Vibrational origin of the fast relaxation processes in molecular glass-formers

2001-04-14

arxiv.org/abs/cond-mat/0104265v1

Europhys. Lett. 60, 92 (2002)

Physics

Condensed Matter

Soft Condensed Matter

RevTeX, 5 pages, 4 eps figures

Scientific paper

10.1209/epl/i2002-00324-1

We study the interaction of the relaxation processes with the density fluctuations by molecular dynamics simulation of a flexible molecule model for o-terphenyl (oTP) in the liquid and supercooled phases. We find evidence, besides the structural relaxation, of a secondary vibrational relaxation whose characteristic time, few ps, is slightly temperature dependent. This i) confirms the result by Monaco et al. [Phys. Rev, E 62, 7595 (2000)] of the vibrational nature of the fast relaxation observed in Brillouin Light Scattering (BLS) experiments in oTP; and ii) poses a caveat on the interpretation of the BLS spectra of molecular systems in terms of a purely center of mass dynamics.

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