Universal nonexponential relaxation: Complex dynamics in simple liquids

D.A. Turton, Klaas Wynne

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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.
Original languageEnglish
Pages (from-to)201101
JournalJournal of Chemical Physics
Volume131
Issue number20
DOIs
Publication statusPublished - 30 Nov 2009

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Keywords

  • argon
  • diffusion
  • krypton
  • librational states
  • liquid structure
  • liquid theory
  • optical Kerr effect
  • vibrational modes
  • xenon

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