Ion drag on an isolated particulate in a low-pressure discharge

M. D. Kilgore, J. E. Daugherty, R. K. Porteous, D. B. Graves

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Classical scattering theory is used to calculate momentum-transfer cross sections between positive ions and isolated particulates in glow discharges for several model particle sheath potentials. Cross sections calculated from a potential profile obtained using self-consistent orbit (Poisson-Vlasov) theory, an attractive screened Coulomb potential, and an attractive cutoff Coulomb potential are compared. At high ion energies, all model potentials result in the same cross-section dependence on ion energy. At low ion energies, however, the cutoff Coulomb potential gives a cross section too low by about a factor of 10. The screened Coulomb potential and Poisson-Vlasov theory potential result in momentum-transfer cross sections equal to within 30% over the entire range of ion energies. An approximate analytic expression for the momentum transfer rate coefficient is given for order of magnitude estimation of the ion drag force.

Original languageEnglish (US)
Pages (from-to)7195-7202
Number of pages8
JournalJournal of Applied Physics
Issue number11
StatePublished - 1993
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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