Ionic dynamics in a simple molten salt

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Abstract
The velocity autocorrelation function in a simple molten salt is expressed in terms of both the longitudinal and transverse components of the momentum density fluctuations. Charge-ordering effects tend to suppress fluctuations in the total number density with the result that there is no significant coupling (via the longitudinal current component) to well defined collective density excitations. Hence, unlike the one-component plasma where the mass and charge density fluctuations coincide, the velocity autocorrelation function is not oscillatory, and gives results in quite good agreement with computer simulation data. The authors extend the method to investigate momentum transfer, and by taking charge ordering into account are able to discuss the charge current autocorrelation function. A simple physical explanation is given for the deviations from the Nernst-Einstein relation between the self-diffusion coefficients and the conductivity.

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