Intra-molecular origin of the fast relaxations observed in the Brillouin light scattering spectra of molecular glass-formers
arXiv:cond-mat/0009008 · doi:10.1103/PhysRevE.62.R7595
Abstract
The Brillouin light scattering spectra of the o-terphenyl single crystal are compared with those of the liquid and the glass phases. This shows: i) the direct evidence of a fast relaxation at 5 GHz in both the single crystal and the glass; ii) a similar temperature dependence for the attenuation of the longitudinal sound waves in the single crystal and the glass; and iii) the absence of coupling between the fast relaxation and the transverse acoustic waves. These results allow us to assign such a relaxation to the coupling between the longitudinal acoustic waves and intra-molecular vibrations, and therefore to exclude any relationship between it and the glass transition.
arXiv comment4 Pages, 4 Figures
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