Langmuir probe measurement of electron temperature in high-pressure plasmas

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Abstract
The effect upon measurements of electron temperature in high-pressure plasmas of the cooling of the plasma electrons by the inherently cold layer of gas surrounding the probe has been investigated. Theoretical considerations indicate that while cooling effects can be substantial, accurate electron temperature measurements can be obtained if the probe is sufficiently small or is moved through the plasma at sufficient velocity. These conclusions are at variance with the calculations of some other workers but are in good agreement with experimental results reported in this paper.