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Ionization Phenomena in a Gas-Particle Plasma

Gibson, Edward G. (1966) Ionization Phenomena in a Gas-Particle Plasma. Physics of Fluids, 9 (12). pp. 2389-2399. ISSN 1070-6631. doi:10.1063/1.1761630.

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Particles in a plasma can appreciably change the electron density from the value it would assume if the particles were not present. The case of pure particle ionization, in which there is only thermionic emission from the particles and no gas ionization, is first considered. It is established that the potential and the charge distributions can be divided into a strong shielding regime, in which most of the free electrons are packed close to the particle surfaces in regions of high potential, and its direct opposite, a weak shielding regime. In both regimes, the free-electron content of the plasma is most readily altered by variations in the particle size, rather than in the work function or particle temperature. The suppression of one form of ionization by the other when both particle and gas contribution to the electron density are comparable is next investigated. In the case of gaseous ionization enhancement it is shown that, if the thermionically emitting particles are hotter than the gas, the electron temperature will also be higher than that of the gas and the gaseous ionization thereby enhanced. Lastly, it is shown that in some transient situations, the particles are able to control the time rate of change of the electron density.

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Additional Information:© 1966 American Institute of Physics. Received 15 December 1965; final manuscript received 1 September 1966. It is a pleasure for the author to express his appreciation to Dr. Edward Zukoski for many stimulating discussions during this investigation. Gratitude is also expressed to Dr. Frank Marble, who introduced the author to the field and has given invaluable advice throughout the progress of the work. Dr. Stanley Byron is thanked for some enlightening discussions on some of the latter points in the paper. This research was carried out at the Daniel and Florence Guggenheim Jet Propulsion Center at the California Institute of Technology and supported by the Air Force Office of Scientific Research under Grant AF-AFOSR-160-63. The paper was written while the author was at the Research Laboratories of the Philco Corporation, Newport Beach, California.
Group:Guggenheim Jet Propulsion Center
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Air Force Office of Scientific Research (AFOSR)AF-AFOSR-160-63
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Guggenheim Jet Propulsion CenterUNSPECIFIED
Issue or Number:12
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ID Code:21490
Deposited By: Ruth Sustaita
Deposited On:21 Dec 2010 23:29
Last Modified:09 Nov 2021 15:57

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