Interactions of charged dust particles in clouds of charges |
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Authors: | Vladimir A Gundienkov Sergey I Yakovlenko |
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Institution: | (1) General Physics Institute, Russian Academy of Science, Vavilova St. 38, 119991 Moscow, Russia |
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Abstract: | Two charged dust particles inside a cloud of charges are considered as Debye atoms forming a Debye molecule. Cassini coordinates
are used for the numerical solution of the Poisson-Boltzmann equation for the charged cloud. The electric force acting on
a dust particle by the other dust particle was determined by integrating the electrostatic pressure on the surface of the
dust particle. It is shown that attractive forces appear when the following two conditions are satisfied. First, the average
distance between dust particles should be approximately equal to two Debye radii. Second, attraction takes place when similar
charges are concentrated predominantly on the dust particles. If the particles carry a small fraction of total charge of the
same polarity, repulsion between the particles takes place at all distances. We apply our results to the experiments with
thermoemission plasma and to the experiments with nuclear-pumped plasma. |
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Keywords: | dust particle Debye atom Debye molecule Poisson-Boltzmann equation Cassini coordinates thermoemission plasma nuclear pumped plasma |
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