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Evolution of spatial distribution of charged particulates under the action of an exteal force is investigated.It is found that starting from a homogeneous Maxwellian distribution of particulates,clusters can form and aggregate.The evolution process,as well as the asymptotic number and configuration of the clusters formed,depends strongly on the strength of the exteal force.The particulates in most of the final clusters are in the crystal state,as can also be deduced from the corresponding velocity and auto-correlation functions.