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On the anomalous behaviour of microscopic diffusion of liquid water

A Cunsolo1,2, A Orecchini1,3, C Petrillo1,3 and F Sacchetti1,3

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We propose here a new interpretation of recent quasi-elastic neutron scattering (QENS) measurements on water. A line-shape analysis based on a stretched exponential ansatz for the time decay of density fluctuations enabled us to observe an anomalous dependence on the exchanged momentum of relevant relaxation parameters. We discuss this effect and relate it to an a priori uncorrelated anomaly, previously evidenced by diffraction measurements.


PACS

66.10.C- Diffusion and thermal diffusion

61.05.fg Neutron scattering (including small-angle scattering)

Subjects

Soft matter, liquids and polymers

Dates

Issue 41 (17 October 2007)

Received 30 April 2007, in final form 14 June 2007

Published 27 September 2007



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