Physics – Plasma Physics
Scientific paper
2009-04-21
Contrib. Plasma Phys. 49, 303-315 (2009)
Physics
Plasma Physics
13 pages, 6 figures, accepted for publication in Contrib. Plasma Phys. (2009)
Scientific paper
10.1002/ctpp.200910028
We recently questioned the treatment of a dust particle as a perfect absorber for electrons and ions and proposed a surface model for the charge of a dust particle in a quiescent plasma which combines the microscopic physics at the grain boundary (sticking into and desorption from external surface states) with the macrophysics of the discharge (plasma collection fluxes). Within this model the charge and partial screening of the particle can be calculated without relying on the condition that the total electron collection flux balances on the grain surface the total ion collection flux. Grain charges obtained from our approach compared favorably with experimental data. The purpose of this paper is to describe our model in more detail, in particular, the hypotheses on which it is built, contrast it with the standard charging models based on flux balancing on the grain surface, and to analyze additional experimental data.
Bronold Franz Xaver
Deutsch H.
Fehske Holger
Kersten Holger
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