Non-Brownian molecular self-diffusion in bulk water

Details Non-Brownian molecular self-diffusion in bulk water Non-Brownian molecular self-diffusion in bulk water

2010-10-06

arxiv.org/abs/1010.1175v1

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 1 figure

Scientific paper

The paper presents the velocity autocorrelation spectrum of bulk water measured by a new technique of NMR modulated gradient spin echo method. This technique is unprecedented for the spectrum measurement in the frequency interval between a few Hz to about 100 kHz with respect to directness and clarity of results and shows that a simple model of Brownian self-diffusion is not applicable to describe the diffusion dynamics of water molecules. The observed temperature dependant spectra of water show the existence of a slow chain-like dynamics in water, which we explain by coupling of diffusing molecule to broken bonds in the hydrogen bond network.

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