Temperature dependence of the Landau-Placzek ratio in liquid water

V. A. Zykova, Y. A. Karpegina, V. K. Malinovsky, N. V. Surovtsev

Research output: Contribution to journalArticlepeer-review

Abstract

Rayleigh-Brillouin light scattering is studied in liquid water over the range from 249 to 365 K. Experiments are carried out with a high spectral resolution (0.1 GHz), eliminating any contribution of the structural relaxation to the elastic line. The Landau-Placzek ratio is found as the ratio of the Rayleigh and Brillouin intensities. In the whole temperature range, the Landau-Placzek ratio is found to be in good agreement with a prediction of the theory with a pair of independent thermodynamic variables, pressure and entropy. This description is usually used for single-component homogeneous liquids. An excess of the Landau-Placzek ratio above the prediction is expected for inhomogeneous liquids and is observed, for example, in glass-forming liquids below a certain temperature. In contrast to glass-forming liquids, no excess of elastically scattered light increasing at low temperatures is observed for the Landau-Placzek ratio of water. This suggests that the Landau-Placzek ratio of liquid water can be described by a homogeneous structure, and the idea of the water structure consisting of two structural motifs may not be necessary to explain the experimental ratio.

Original languageEnglish
Article number042608
Number of pages5
JournalPhysical Review E
Volume96
Issue number4
DOIs
Publication statusPublished - 23 Oct 2017

Keywords

  • SUPERCOOLED WATER
  • THERMODYNAMIC BEHAVIOR
  • BRILLOUIN-SCATTERING
  • ANOMALOUS PROPERTIES
  • MODEL
  • COMPRESSIBILITY
  • EXPANSIVITY
  • DENSITY
  • ORIGIN
  • INDEX

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