Dynamical coupling in simple molten salts

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Abstract
The dynamical properties of simple molten salts are studied with particular attention to cross-correlation between two species. The general formulation of the dynamics in two-component liquids is made by describing partial density fluctuations with the memory function formalism, and thereby introducing effective potentials in response functions. The excitation spectra for charge density and number (or mass) density fluctuations are calculated by assuming the simple relaxation for the polarisation function in simple molten salts, in good agreement with the molecular dynamics calculation. It is found that the dynamical coupling representing cross-correlations is no longer negligible below the wavenumber at the first peak of the static structure factor for number density fluctuations.

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