We describe an experimental study of the dynamic structure factor of liquid glycerol performed by complementary inelastic techniques such as Brillouin visible, ultraviolet and x-ray scattering. The spectra have been collected as a function of both temperature and momentum transfer. The relevant hypersonic parameters are evaluated from the spectral lineshape analysis modelling the data with a simple hydrodynamic profile. The study of their frequency dependence allows us to observe the occurrence of an active structural relaxation and to measure the related timescale. We also find signatures of further relaxation processes occurring below the accessible frequency window. As a result, the dynamic window traditionally probed in spectroscopic experiments is greatly extended and partially bridges the gap between MHz and THz techniques.

Structural relaxation in the dynamics of glycerol: A joint visible, UV and x-ray inelastic scattering study / A. Giugni, A. Cunsolo. - In: JOURNAL OF PHYSICS. CONDENSED MATTER. - ISSN 0953-8984. - 18:3(2006), pp. 889-902. [10.1088/0953-8984/18/3/008]

Structural relaxation in the dynamics of glycerol: A joint visible, UV and x-ray inelastic scattering study

A. Giugni
Co-primo
;
2006

Abstract

We describe an experimental study of the dynamic structure factor of liquid glycerol performed by complementary inelastic techniques such as Brillouin visible, ultraviolet and x-ray scattering. The spectra have been collected as a function of both temperature and momentum transfer. The relevant hypersonic parameters are evaluated from the spectral lineshape analysis modelling the data with a simple hydrodynamic profile. The study of their frequency dependence allows us to observe the occurrence of an active structural relaxation and to measure the related timescale. We also find signatures of further relaxation processes occurring below the accessible frequency window. As a result, the dynamic window traditionally probed in spectroscopic experiments is greatly extended and partially bridges the gap between MHz and THz techniques.
Brillouin-scattering; glass-transition; light; spectroscopy; dispersion; behavior; density; liquid; shear
Settore FIS/03 - Fisica della Materia
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/827913
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