Open AccessUniversal nonexponential relaxation: Complex dynamics in simple liquids
Author(s) -
David A. Turton,
Klaas Wynne
Publication year - 2009
Publication title -
the journal of chemical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.071
H-Index - 357
eISSN - 1089-7690
pISSN - 0021-9606
DOI - 10.1063/1.3265862
Subject(s) - xenon , relaxation (psychology) , krypton , argon , chemical physics , dynamics (music) , coupling (piping) , simple (philosophy) , exponential function , noble gas , materials science , thermodynamics , molecular physics , chemistry , statistical physics , physics , atomic physics , psychology , social psychology , mathematical analysis , philosophy , mathematics , epistemology , acoustics , metallurgy
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
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