Abstract
The radial distribution functions for a central force model of water, derived from a combination of computer simulation and integral equation techniques, are used to calculate the density-density and charge-charge structure factors. These quantities are compared with neutron scattering measurements of light and heavy water. From the behaviour of the density-density and charge-charge structure factors in the thermodynamic limit of small wavenumbers, the extent of density and charge fluctuations is estimated. In particular, the density fluctuations in water are found to extend to longer distances than charge fluctuates. The relations between the charge fluctuations and the behaviour of the static dielectric function as well as some dynamical properties are discussed.
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