Deviation from local thermal equilibrium in an atmospheric argon arc plasma

J. Leclair, D.C. Schram

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The electron temperature T/sub e/ is obtained from five optically non-thin Ar I line-transitions. It is possible to measure T/sub e/ without any knowledge of transition probabilities. The electron density N/sub e/ can be calculated from measured excited level densities using the partial LTE model. It appears that there is a functional dependence of N/sub e/ on T/sub e/, suggesting that transport processes are of only minor importance. The deviations from LTE can be described by assuming a N/sub e/-dependent overpopulation of the ground level of Ar I. This overpopulation factor varies from 1.9 for N/sub e/=2*10/sup 16/ cm/sup -3/ to 1.25 for N/sub e/=2*10/sup 17/ cm/sup -3/
Original languageEnglish
Title of host publicationICPIG : International Conference on Phenomena in Ionized Gases : proceedings, 13th, Berlin, September 12-17, 1977, contributed papers II
Place of PublicationLeipzig, East Germany
PublisherPhysical Society, German Democratic Republic
Publication statusPublished - 1977


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