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- W2016232525 abstract "High-resolution, inelastic x-ray scattering measurements of the dynamic structure factor $S(Q,ensuremath{omega})$ of liquid water have been performed for wave vectors $Q$ between 4 and $30phantom{rule{0.3em}{0ex}}{mathrm{nm}}^{ensuremath{-}1}$ in distinctly different thermodynamic conditions ($T=263--420phantom{rule{0.3em}{0ex}}mathrm{K}$; at, or close to, ambient pressure and at $P=2phantom{rule{0.3em}{0ex}}mathrm{kbar}$). In agreement with previous inelastic x-ray and neutron studies, the presence of two inelastic contributions (one dispersing with $Q$ and the other almost nondispersive) is confirmed. The study of their temperature and $Q$ dependence provides strong support for a dynamics of liquid water controlled by the structural relaxation process. A viscoelastic analysis of the $Q$-dispersing mode, associated with the longitudinal dynamics, reveals that the sound velocity undergoes a complete transition from the adiabatic sound velocity $({c}_{0})$ (viscous limit) to the infinite-frequency sound velocity $({c}_{ensuremath{infty}})$ (elastic limit). On decreasing $Q$, as the transition regime is approached from the elastic side, we observe a decrease of the intensity of the second, weakly dispersing feature, which completely disappears when the viscous regime is reached. These findings unambiguously identify the second excitation to be a signature of the transverse dynamics with a longitudinal symmetry component, which becomes visible in $S(Q,ensuremath{omega})$ as soon as the purely viscous regime is left." @default.
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- W2016232525 date "2005-01-11" @default.
- W2016232525 modified "2023-10-15" @default.
- W2016232525 title "High-frequency longitudinal and transverse dynamics in water" @default.
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- W2016232525 doi "https://doi.org/10.1103/physreve.71.011501" @default.
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