Journal article
Charging of particles in a plasma
Plasma sources science & technology, Vol.3(3), pp.400-406
08/01/1994
DOI: 10.1088/0963-0252/3/3/025
Abstract
Several models that predict the charge of particles in a plasma are reviewed. The simplest is based on orbit-limited probe theory. This basic model can be improved by adding several effects: charge reduction at high dust densities, electron emission, ion trapping and fluctuations. The charge is reduced at high dust densities, when a significant fraction of the charge in the plasma resides on the particles, depleting the plasma. Electron emission due to electron impact or ultraviolet exposure can cause a particle to have a positive charge, which has useful implications for plasma processing, since particles are confined in a discharge only if they have a negative charge. Ion trapping occurs due to ion-neutral collisions within the attractive Debye sphere of a negatively charged particle. Trapped ions reduce the net electric force on a particle. A particle's charge fluctuates because the currents collected from the plasma consist of discrete charges arriving at the particle at random intervals. The root mean square fractional fluctuation level varies as 0.5(N)- 12 / where (N)=(Q)/e is the mean number of electron charges on the particle.
Details
- Title: Subtitle
- Charging of particles in a plasma
- Creators
- J Goree - University of Iowa
- Resource Type
- Journal article
- Publication Details
- Plasma sources science & technology, Vol.3(3), pp.400-406
- DOI
- 10.1088/0963-0252/3/3/025
- ISSN
- 0963-0252
- eISSN
- 1361-6595
- Language
- English
- Date published
- 08/01/1994
- Academic Unit
- Physics and Astronomy; Mechanical Engineering
- Record Identifier
- 9984200025402771
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