Vibrational origin of the fast relaxation processes in molecular glass-formers
Soft Condensed Matter
2009-11-07 v1 Disordered Systems and Neural Networks
Abstract
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.
Keywords
Cite
@article{arxiv.cond-mat/0104265,
title = {Vibrational origin of the fast relaxation processes in molecular glass-formers},
author = {S. Mossa and G. Monaco and G. Ruocco},
journal= {arXiv preprint arXiv:cond-mat/0104265},
year = {2009}
}
Comments
RevTeX, 5 pages, 4 eps figures