Polarized Brillouin Scattering in Salol: Effects of Rotation-Translation Coupling

TL;DR

This study investigates the VV-polarized Brillouin scattering spectrum of salol, revealing a new low-frequency VV-dip feature caused by rotation-translation coupling, aligning well with recent theoretical predictions.

Contribution

It provides experimental evidence of rotation-translation coupling effects in salol's Brillouin spectrum, confirming recent theoretical models.

Findings

Discovery of a VV-dip feature at low frequencies above 300K

Good agreement between experimental spectra and theoretical predictions

Confirmation of rotation-translation coupling effects in molecular glassformers

Abstract

We have studied the 90 degree VV-polarized Brillouin scattering spectrum of the molecular glassformer salol and observed a previously unnoticed VV-dip feature at low frequencies for temperatures above 300K. This new feature is a consequence of rotation-translation coupling, as recently predicted by Pick, Franosch et al [Eur. Phys. J. B 31, 217, 229 (2003)], who showed its relationship to the Rytov dip that occurs in the corresponding VH spectrum. The analysis of the spectra shows good agreement with the theoretical predictions.