PARTICLE CHARGING IN LOW-PRESSURE PLASMAS

被引:200
作者
MATSOUKAS, T
RUSSELL, M
机构
[1] Department of Chemical Engineering, Pennsylvania State University, University Park
关键词
D O I
10.1063/1.359451
中图分类号
O59 [应用物理学];
学科分类号
摘要
Particles embedded in a plasma acquire a net charge as a result of collisions with electrons and ions. Due to the stochastic nature of encounters between particle and charged species, the instantaneous charge fluctuates. The static properties of the charge fluctuations are quantified for particles surrounded by an undisturbed plasma in orbital motion limit. For particles that satisfy the condition e2/4πε0RkTe≪1 the charge distribution is a Gaussian function whose average and variance is related to the ion and electron currents toward the particle. For a Maxwellian plasma, in particular, analytical solutions are developed for the average charge and the variance as a function of the parameters of the plasma n e/ni, Te/Ti, and M e/Mi. Finally, the methodology is extended to non-Maxwellian plasmas using the Druyvesteyn as an example. © 1995 American Institute of Physics.
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页码:4285 / 4292
页数:8
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