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- W2042809464 abstract "Abstract The recent construction of the inelastic ultra violet scattering (IUVS) beamline at the Elettra Synchrotron Light Laboratory, allows investigations of collective dynamics of disordered systems in the so-called mesoscopic region of exchanged energy and momentum, namely 10–10 3 μeV and 0.3–0.03 nm −1 , unexplorable by other techniques. IUVS is the appropriate tool for studying all systems that are expected to own, in the mesoscopic region, intriguing properties like the divergence of relaxation time and changes in dynamics. Here we report measurements of Dynamic Structure Factor of liquid and undercooled water, from T = 313 K down to T = 264 K, at a momentum transfer of about 0.1 nm −1 . We observed the structural relaxation to set in the supercooled temperature region, where the frequency of sound modes probed by IUVS matches the inverse relaxation time of water. Moreover, the recent improvement of energy resolution and statistics has made it possible the determination of the infinite frequency limit of sound speed, c ∞ . We compare the T -dependence of c ∞ to the data obtained by Inelastic X-ray Scattering, in order to point out the complementarity power of IUVS technique." @default.
- W2042809464 created "2016-06-24" @default.
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- W2042809464 date "2005-06-01" @default.
- W2042809464 modified "2023-09-23" @default.
- W2042809464 title "Infinite frequency sound velocity in liquid water by inelastic UV scattering" @default.
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- W2042809464 doi "https://doi.org/10.1016/j.elspec.2005.01.076" @default.
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