Quasielastic neutron scattering investigation of the pressure dependence of molecular motions in liquid water

The Journal of Chemical Physics
A CunsoloFrancesco Sacchetti

Abstract

We report on a high-resolution, high-statistics, quasielastic neutron scattering (QENS) experiment on liquid water, aimed at accurately measuring the pressure dependence of the single-particle dynamic response function at low wave vector transfers, namely, from 0.26 to 1.32 A(-1). High-pressure QENS data were collected along the T = 268 K isothermal path over the rather extended pressure range of 80 up to 350 MPa, a thermodynamic region so far unexplored by this microscopic technique. The analysis of the measured line shapes enabled us to draw a consistent picture of the wave vector and pressure dependences of the diffusion mechanisms in liquid water, against which the most recent models for water dynamics can be checked. In close similarity with the case of supercooled water, the relaxing-cage model was found to provide a quantitatively more accurate description of the molecular motions and their pressure evolution in liquid water.

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Citations

Feb 26, 2009·The Journal of Chemical Physics·Masaru NakadaMasakatsu Misawa
Apr 19, 2011·The Journal of Chemical Physics·Johan QvistBertil Halle
Dec 11, 2013·The Journal of Chemical Physics·Alessandro CunsoloAyman H Said
Jan 27, 2012·Journal of Physics. Condensed Matter : an Institute of Physics Journal·E MamontovA I Kolesnikov
Jan 27, 2012·Journal of Physics. Condensed Matter : an Institute of Physics Journal·A OrecchiniF Sacchetti
Oct 17, 2007·Journal of Physics. Condensed Matter : an Institute of Physics Journal·A CunsoloF Sacchetti
Nov 19, 2013·Physical Review Letters·L E BoveA M Saitta
Jul 16, 2013·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Tatsuya KikuchiMasatoshi Arai
Dec 1, 2010·The Journal of Physical Chemistry. B·Alessandro CunsoloFrancesco Sacchetti
May 20, 2016·Chemical Reviews·Katrin Amann-WinkelLawrie Skinner
Nov 15, 2019·The Journal of Physical Chemistry. B·Pascale Friant-MichelClaude Millot
Mar 28, 2020·The Journal of Physical Chemistry Letters·Andrea TaschinRenato Torre

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