It is shown that the interaction of dust with neutral plasma particles
can lead to attractive forces between dust particles, both in the case where the
distance between dust particles is less than the mean free path of neutral
particles and in the case where it is greater. The expressions for attractive forces
differs in the two limits only by a numerical coefficient. The additional force of
dust interaction is found to be due to the neutrals created by recombination of
charged plasma particles on the surface of dust particles. The influence of
radiative dust cooling on dust–dust interaction is considered.
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