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Spectroscopic measurements of radial temperature distributions in short electric arcs

The authors report spectroscopic measurements of radial temperature distributions within the plasma of a short metal arc in air. A semi-automatic spectroscopic set-up enabled them to determine spatial-temporal temperature distributions in unstable arc channels. The absence of self-absorption for the used atomic lines within the plasma volume was checked by a careful analysis of line profiles with a Fabry-Perot interferometer. The evaluated temperature profile reveals a narrow peak near the electrode with a width of about 40 mu m, indicating a strong contraction of the current conducting region.