Abstract
The concept of a microscopic velocity field is invoked to describe atomic dynamics in liquids. In particular, it leads to an excellent description of the velocity autocorrelation function in simple liquid metals. This provides some justification for using the framework to investigate the diffusion mechanism. We demonstrate a Stokes-Einstein type of relationship between the self-diffusion and shear viscosity coefficients, which is confirmed experimentally in simple liquid metals near the melting point.
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