Ultraviolet Brillouin spectroscopy of glass-forming glycerol

Abstract

The newly built ultraviolet Raman–Brillouin spectrometer at the Università di L'Aquila is described. We have used it to perform accurate ultraviolet and visible Brillouin spectra of glass-forming glycerol. Data with high contrast and high dynamic range in the unexplored region of wave vectors from 40 up to about 70 µm⁻¹ have been obtained for the first time. The spectra are analysed in terms of generalized hydrodynamics with a frequency-dependent viscosity.

Notes

The value of the index of refraction in the UV range of 266 nm has been extrapolated from the behaviour in the visible.