Universal nonexponential relaxation: Complex dynamics in simple liquids

D.A. Turton, Klaas Wynne

Research output: Contribution to journal › Article

28 Citations (Scopus)

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.
LanguageEnglish
Pages201101
JournalJournal of Chemical Physics
Volume131
Issue number20
DOIs
Publication statusPublished - 30 Nov 2009

Fingerprint

Liquids
liquids
Krypton
Optical Kerr effect
Noble Gases
Xenon
Argon
krypton
Kerr effects
xenon
coupled modes
rare gases
argon
Spectroscopy
Glass
Water
glass
water
spectroscopy

Keywords

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

Cite this

Turton, D.A. ; Wynne, Klaas. / Universal nonexponential relaxation: Complex dynamics in simple liquids. In: Journal of Chemical Physics. 2009 ; Vol. 131, No. 20. pp. 201101.
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Turton, DA & Wynne, K 2009, 'Universal nonexponential relaxation: Complex dynamics in simple liquids' Journal of Chemical Physics, vol. 131, no. 20, pp. 201101. https://doi.org/10.1063/1.3265862

Universal nonexponential relaxation: Complex dynamics in simple liquids. / Turton, D.A.; Wynne, Klaas.

In: Journal of Chemical Physics, Vol. 131, No. 20, 30.11.2009, p. 201101.

Research output: Contribution to journal › Article

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AU - Wynne, Klaas

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N2 - 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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KW - argon

KW - diffusion

KW - krypton

KW - librational states

KW - liquid structure

KW - liquid theory

KW - optical Kerr effect

KW - vibrational modes

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Turton DA, Wynne K. Universal nonexponential relaxation: Complex dynamics in simple liquids. Journal of Chemical Physics. 2009 Nov 30;131(20):201101. https://doi.org/10.1063/1.3265862

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