Spectral Signatures of the Diffusional Anomaly in Water

Details Spectral Signatures of the Diffusional Anomaly in Water Spectral Signatures of the Diffusional Anomaly in Water

2004-05-11

arxiv.org/abs/cond-mat/0405210v1

Physics

Condensed Matter

Soft Condensed Matter

5 Pages, 4 Figures

Scientific paper

10.1063/1.1860555

Analysis of power spectrum profiles for various tagged particle quantities in bulk SPC/E water is used to demonstrate that variations in mobility associated with the diffusional anomaly are mirrored in the exponent of the \onebyf\ region. Monitoring of \onebyf behaviour is shown to be a simple and direct method for linking phenomena on three distinctive length and time scales: the local molecular environment, hydrogen bond network reorganisations and the diffusivity. The results indicate that experimental studies of supercooled water to probe the density dependence of $1/f^\alpha$ spectral features, or equivalent stretched exponential behaviour in time-correlation functions, will be of interest.

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