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Title: On the absence of a positive sound dispersion in the THz dynamics of glycerol: an inelastic x-ray scattering study

Abstract

The high frequency transport properties of glycerol are derived from inelastic x-ray scattering spectra measured at different pressures and compared with ultrasound absorption data. As a result, the presence of two distinct relaxation processes is inferred: a slow one, occurring in the GHz window and having an essentially structural character, and a fast one, related instead to microscopic degrees of freedom. While the former originates a neat increase of the apparent, i.e. frequency-dependent, sound velocity, the latter induces no visible dispersive effects on the acoustic propagation. The observed behavior is likely paradigmatic of all glass formers near or below the melting and it is here discussed and explained in some detail.

Authors:
 [1]
  1. (BNL)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
DOE - BASIC ENERGY SCIENCES
OSTI Identifier:
1049539
Resource Type:
Journal Article
Journal Name:
J. Phys. Condens. Matter
Additional Journal Information:
Journal Volume: 24; Journal Issue: (37) ; 2012; Journal ID: ISSN 0953-8984
Country of Publication:
United States
Language:
ENGLISH
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABSORPTION; ACOUSTICS; DEGREES OF FREEDOM; GLASS; GLYCEROL; MELTING; RELAXATION; SCATTERING; SPECTRA; TRANSPORT; VELOCITY

Citation Formats

Cunsolo, Alessandro. On the absence of a positive sound dispersion in the THz dynamics of glycerol: an inelastic x-ray scattering study. United States: N. p., 2012. Web. doi:10.1088/0953-8984/24/37/375104.
Cunsolo, Alessandro. On the absence of a positive sound dispersion in the THz dynamics of glycerol: an inelastic x-ray scattering study. United States. doi:10.1088/0953-8984/24/37/375104.
Cunsolo, Alessandro. Tue . "On the absence of a positive sound dispersion in the THz dynamics of glycerol: an inelastic x-ray scattering study". United States. doi:10.1088/0953-8984/24/37/375104.
@article{osti_1049539,
title = {On the absence of a positive sound dispersion in the THz dynamics of glycerol: an inelastic x-ray scattering study},
author = {Cunsolo, Alessandro},
abstractNote = {The high frequency transport properties of glycerol are derived from inelastic x-ray scattering spectra measured at different pressures and compared with ultrasound absorption data. As a result, the presence of two distinct relaxation processes is inferred: a slow one, occurring in the GHz window and having an essentially structural character, and a fast one, related instead to microscopic degrees of freedom. While the former originates a neat increase of the apparent, i.e. frequency-dependent, sound velocity, the latter induces no visible dispersive effects on the acoustic propagation. The observed behavior is likely paradigmatic of all glass formers near or below the melting and it is here discussed and explained in some detail.},
doi = {10.1088/0953-8984/24/37/375104},
journal = {J. Phys. Condens. Matter},
issn = {0953-8984},
number = (37) ; 2012,
volume = 24,
place = {United States},
year = {2012},
month = {10}
}