Universal nonexponential relaxation: Complex dynamics in simple liquids

Turton, D.A. and Wynne, K. (2009) Universal nonexponential relaxation: Complex dynamics in simple liquids. Journal of Chemical Physics, 131(20), p. 201101. (doi:10.1063/1.3265862)

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Publisher's URL: http://dx.doi.org/10.1063/1.3265862

Abstract

The dynamics of the noble-gas liquids underlies that of all liquids making them an important prototypical model system. Using optical Kerr-effect spectroscopy we show that for argon, krypton, and xenon, both the librational and diffusional contributions to the spectrum are surprisingly complex. The diffusional relaxation appears as a stretched-exponential, such as widely found in studies of structured (e.g., glass-forming) liquids and as predicted by mode-coupling theory. We show that this behavior is remarkably similar to that measured in water and suggest that it is a fundamental or universal property.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Wynne, Professor Klaas
Authors: Turton, D.A., and Wynne, K.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Journal of Chemical Physics
ISSN:0021-9606
Published Online:30 November 2009

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
563561Terahertz spectroscopy of aqueous ionic solutions to understand the role of hydrogen-bond network breaking and strengthening in the HofmeisterKlaas WynneEngineering & Physical Sciences Research Council (EPSRC)EP/E046541/1CHEM - CHEMISTRY
559071Two-dimensional terahertz/IR spectroscopy: a unique probe of ultrafast hydrogen-bond dynamics of liquid water and model systems.Klaas WynneEngineering & Physical Sciences Research Council (EPSRC)EP/F06926X/1CHEM - CHEMISTRY