Atomic dynamics and momentum transfer in dense liquids

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Abstract
A simple representation for the velocity field is used to investigate momentum transfer in a dense liquid. An appropriate method of discussing the process is by means of the time-dependent correlation of the initial velocity of an atom with the velocities of a group of atoms, within a sphere, whose centre is the location of the same atom at some later time. As the auto-correlation contribution decays, the correlation with the velocities of the surrounding atoms builds up as the momentum transfer progresses. The technique is applied to a liquid metal and a rigid-sphere fluid. It is shown how the information obtained in this way may be used to gain some physical insight into atomic dynamics in liquids.

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