Probe diagnostics of electronegative plasmas with bi-Maxwellian electrons

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Abstract

A method to detect the parameters of electronegative plasmas with bi-Maxwellian electrons using a Langmuir probe is proposed by applying the test function. The radial model for the positive ion
collection is extended and found to be more appropriate for density detection than the orbital motion limited model. The parameters of a diffused Ar/SF6 plasma are obtained by cylindrical and spherical
probes for various Ar/SF6 ratios over a pressure range from 0.5 to 10 mTorr. The density ratio of bulk to hot electrons decreases from about 50 in Ar plasma to less than one for Ar/SF6, of which the SF6 flow is 0.05 standard cubic centimeters per minute. The hot electron group cannot be neglected for density ratios of negative ions to electrons lower than 100, though approximation of Maxwellian electrons is valid for larger density ratios. © 2001 American Institute of Physics
Original languageEnglish
JournalJournal of Applied Physics
Volume89
Issue number4
Pages (from-to)2058-2064
ISSN0021-8979
DOIs
Publication statusPublished - 2001
Externally publishedYes

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