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From our solution of Maxwell's equations for aggregates of spherical particles, we answer questions such as: When is a particle isolated, or when can one not dist&nguish one small particle near or in contact with a larger one? In order to do so, the theory is limited to the dipolar approximation and applied to binary clusters of metallic particles; numerical results are presented specifically for sodium. The dielectric constant contains plasmon effects. A discussion of high-order polar effects is included.

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