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Title: The THz Spectrum of Density Fluctuations of Water: The Viscoelastic Regime

Journal Article · · Advances in Condensed Matter Physics
DOI:https://doi.org/10.1155/2015/137435· OSTI ID:1324811
 [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)

Relevant advances in the knowledge of the water dynamics at mesoscopic scales are reviewed, while mainly focusing on the contribution provided by high resolution inelastic X-ray scattering (IXS). In particular it is discussed how the use of IXS has improved our understanding of viscoelastic properties of water at THz frequencies. This specifically involves some solid-like features such as the onset of shear wave propagation, a sound velocity surprisingly similar to the one of ice, and an anomalously low sound absorption coefficient. All these properties can be explained by assuming the coupling of THz density fluctuations with a structural relaxation process connected to the breaking and forming of hydrogen bonds (HBs). This review also includes more recent IXS results demonstrating that, upon approaching supercritical conditions, relaxation phenomena in water gradually lose their structural character becoming essentially collisional in character. Furthermore, GHz spectroscopy results on supercooled water, suggesting the occurrence of a structural arrest, are discussed. An overview of the new opportunities offered by next generation IXS spectrometers finally concludes this review.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
USDOE Office of Science (SC)
OSTI ID:
1324811
Journal Information:
Advances in Condensed Matter Physics, Vol. 2015; ISSN 1687-8108
Publisher:
HindawiCopyright Statement
Country of Publication:
United States
Language:
ENGLISH
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

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The onset of shear modes in the high frequency spectrum of simple disordered systems: current knowledge and perspectives journal October 2015
Interpreting the Terahertz Spectrum of Complex Materials: The Unique Contribution of the Bayesian Analysis journal September 2019

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