Force between charged particles with ion condensation

We have numerically calculated the interaction forces between two highly ch arged spherical particles embedded in a cloud of small ions with or without charge redistribution on the particle surfaces. Ion condensation near the charged particles leads to reduced electrostatic interaction between the pa rticles, and we find that the effective two-particle interaction is signifi cantly smaller than the values expected from considering only effective sin gle-particle potentials. PACS number(s): 52.25,Zb, 61.25.Hq.