Pressure behavior of the sound velocity of liquid water at room temperature in the terahertz regime

Year: 2011

Authors: Santoro M., Gorelli F. A., Scopigno T., Krisch M., Sette F., Ruocco G.

Autors Affiliation: LENS, European Laboratory for Non Linear Spectroscopy, I-50019 Sesto Fiorentino, Firenze, Italy; IPCF-CNR, UOS Roma “La Sapienza”, I-00185 Roma, Italy; European Synchrotron Radiation Facility, 38043 Grenoble, France; Dipartimento di Fisica, Universit`a di Roma “La Sapienza”, I-00185 Roma, Italy

Abstract: The pressure evolution of the sound velocity in liquid water in the terahertz regime, c(infinity), between 0.05 and 0.88 GPa, at room temperature, has been investigated by synchrotron inelastic x-ray scattering in a diamond anvil cell. We confirm previous results showing that c(infinity) increases with density much less than the adiabatic sound velocity c(s), which is reasonably related to the known structural modifications in the hydrogen bond network. At variance with a previous study where an anomaly was found in the density evolution of c(infinity)-most likely due to the nonisothermal character of the study-the present work reveals a smooth behavior of c(infinity), which could provide a useful constraint to the current theories on liquid water.

Journal/Review: PHYSICAL REVIEW B

Volume: 84 (9)      Pages from: 092301  to: 092301

More Information: We acknowledge the ESRF for provision of beam time at ID28, and we thank D. Gambetti, M. Hoesch, J. Serrano-Gutierrez, A. Beraud, and A. Bossak for fruitful discussions and assistance during the experiments. Two of us, F.A.G. and M.S., have been supported by the European Community, under Contract No. FP7 G.A. No 228334 Laserlabeurope. T.S. has received funding from the European Research Council under the European Community\’s Seventh Framework Program (FP7/2007-2013)/ERC grant Agreement No. 207916.
KeyWords: high pressure physics; liquid water; inelasti x-ray scattering; dynamics; lo+w-density water
DOI: 10.1103/PhysRevB.84.092301

Citations: 6
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