Spectral Signatures of the Diffusional Anomaly in Water

Abstract

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.

arXiv comment5 Pages, 4 Figures

References in corpus (6)

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• Dynamics of simulated water under pressure
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• 1/f noise: a pedagogical review
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• Multiple Time-Scale Behaviour and Network Dynamics in Liquid Methanol
• The Widom line and noise power spectral analysis of a supercritical fluid
• Model-based fit procedure for power-law-like spectra