Инд. авторы:	Zykova V.A., Karpegina Y.A., Malinovsky V.K., Surovtsev N.V.
Заглавие:	Temperature dependence of the Landau-Placzek ratio in liquid water
Библ. ссылка:	Zykova V.A., Karpegina Y.A., Malinovsky V.K., Surovtsev N.V. Temperature dependence of the Landau-Placzek ratio in liquid water // Physical Review E - Statistical, Nonlinear, and Soft Matter Physics. - 2017. - Vol.96. - Iss. 4. - Art.042608. - ISSN 2470-0045. - EISSN 2470-0053 .
Внешние системы:	DOI: 10.1103/PhysRevE.96.042608; PubMed: 29347548; WoS: 000413450300003;
Реферат:	eng: 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.
Ключевые слова:	BRILLOUIN-SCATTERING; ANOMALOUS PROPERTIES; INDEX; SUPERCOOLED WATER; DENSITY; EXPANSIVITY; COMPRESSIBILITY; MODEL; ORIGIN; THERMODYNAMIC BEHAVIOR;
Издано:	2017
Физ. характеристика:	042608