Journal ArticleDOI
Collective dynamics in water by high energy resolution inelastic X-ray scattering.
Francesco Sette,Giancarlo Ruocco,Michael Krisch,Uwe Bergmann,Claudio Masciovecchio,Claudio Masciovecchio,V. Mazzacurati,G. Signorelli,Roberto Verbeni +8 more
TLDR
Thevd of liquid water proposed the exis-tence of high frequency collective excitations which prop-agate with a velocity much higher than that of ordinary sound (fast sound), which would coexist with the ordinary sound, and propagate up to momentum trans-fer comparable with the inverse of the single moleculesize.Abstract:
A propagating excitation with a velocity of sound of $3200\ifmmode\pm\else\textpm\fi{}100$ $\mathrm{m}/\mathrm{s}$ is measured in ${\mathrm{H}}_{2}\mathrm{O}$ at 294 $\mathrm{K}$ between 4 and 14 ${\mathrm{nm}}^{\ensuremath{-}1}$, using inelastic x-ray scattering with 5 $\mathrm{meV}$ energy resolution. The existence of fast sound is therefore demonstrated in an energy-momentum region much wider than that of previous neutron measurements on ${\mathrm{D}}_{2}\mathrm{O}$. The equivalence of the fast sound velocity in ${\mathrm{H}}_{2}\mathrm{O}$ and in ${\mathrm{D}}_{2}\mathrm{O}$ rules out models where this mode propagates only on the hydrogen network. These results show the ability of inelastic x-ray scattering to study the collective dynamics of liquids.read more
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Journal ArticleDOI
Supercooled and glassy water
TL;DR: The authors summarizes the known experimental facts and reviews critically theoretical and computational work aimed at interpreting the observations and providing a unified viewpoint on cold, non-crystalline, metastable states of water.
Journal ArticleDOI
Iron partitioning in Earth's Mantle: Toward a deep lower mantle discontinuity
James Badro,Guillaume Fiquet,François Guyot,Jean-Pascal Rueff,Viktor V. Struzhkin,György Vankó,Giulio Monaco +6 more
TL;DR: A high-spin to low-spin transition occurring in the 60- to 70-gigapascal pressure range, corresponding to depths of 2000 kilometers in Earth's lower mantle, implies that the partition coefficient of iron between ferropericlase and magnesium silicate perovskite, the two main constituents of the lower mantle), may increase by several orders of magnitude.
Journal ArticleDOI
Electronic transitions in perovskite: possible nonconvecting layers in the lower mantle.
TL;DR: The proportion of iron in the low spin state grows with depth, increasing the transparency of the mantle in the infrared region, with a maximum at pressures consistent with the D″ layer above the core-mantle boundary, which suggests the existence of nonconvecting layers in the lowermost mantle.
Journal ArticleDOI
Dynamics of Glasses and Glass-Forming Liquids Studied by Inelastic X-ray Scattering
Francesco Sette,Michael Krisch,Michael Krisch,Claudio Masciovecchio,Claudio Masciovecchio,Giancarlo Ruocco,Giancarlo Ruocco,Giulio Monaco,Giulio Monaco +8 more
TL;DR: In this paper, the authors used inelastic x-ray scattering with millielectron volt energy resolution at the European Synchrotron Radiation Facility in Grenoble, France, to study highfrequency collective dynamics in disordered systems.
Journal ArticleDOI
Phonon spectroscopy by inelastic x-ray scattering
TL;DR: In this article, a review summarizes the developments of these methods focusing on these instrumental developments of the spectrometers using either crystal optics in close-to-backscattering geometry or nuclear resonant techniques.
References
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Book
Dynamics of the liquid state
U. Balucani,Marco Zoppi +1 more
TL;DR: In this paper, the basic dynamical quantitites and collective properties of single-particle properties were investigated. But the experimental side was not considered. And the experimental results were not analyzed in this paper.