A theory for unipolar ``diffusion charging'' of small aerosol particles is developed for the free-molecule and transition regions. The free-molecule theory is, of course, exact within the restrictions imposed on the physical system. The theory for the transition region is based on the Knudsen iteration solution of a relaxation model of the Boltzmann equation. Insufficient experimental data are available to permit detailed comparison with the developed theories.
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Gentry et al. (1967) studied this question.
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