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Transition from a fully ionized plasma to an absorbing surfact

Almeida, N. A.; Benilov, M. S.; Franklin, Raoul and Naidis, G. V. (2004). Transition from a fully ionized plasma to an absorbing surfact. Journal of Physics D: Applied Physics, 37(22) pp. 3107–3116.

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The ionization layer (presheath) separating a fully ionized low-temperature thermal plasma from the space-charge sheath adjacent to a solid surface is described by means of a (multi)fluid model. The character of the solution is governed by α, the ratio of the ionization length to the mean free path for ion–atom collisions. If α ≥ 1, the solution is determined by physically transparent boundary conditions, namely, by the Bohm criterion at the sheath edge and the condition of full ionization on the plasma side of the ionization layer. If α < 1, the latter condition becomes ineffective. An alternative boundary condition is found for a certain range of α below unity, αcr ≤ α < 1. An approximate approach which spans the whole range of α is suggested. While being incomplete theoretically, this approach is sufficient for practical purposes and gives results that are in agreement with experiment. On the other hand, the question of what is the lacking boundary condition in the range 0 < α < αcr remains open and challenging.

Item Type: Journal Item
Copyright Holders: 2004 IOP Publishing Ltd
ISSN: 1361-6463
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 7987
Depositing User: Tracey Moore
Date Deposited: 12 Jun 2007
Last Modified: 07 Dec 2018 09:04
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