We incorporate the exchange interaction into a simulation in which all electron motion, including that involved in screening, is treated explicitly with a molecular-dynamics simulation run concurrently within an ensemble Monte Carlo treatment of scattering. Exchange is treated for the first time in such an approach by a semiclassical modification of the molecular dynamics which takes full account of the Fermi statistics, and in particular does not violate the exclusion principle. A comparison is made with the short-time relaxation data of Becker et al.
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