Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2001-04-14
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.
Monaco Giulio
Mossa Stefano
Ruocco Giancarlo
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