Abstract
The electronic excitation temperature in a direct current positivestreamer discharge based on ultra-thin sheet electrodes was measuredby optical emission spectrometry in order to deposit materials forpotential future applications. It was remarkable that the electronicexcitation temperature (Texc) did not vary monotonicallywith the discharge current, but demonstrated a peak at a certainposition. In a mixture of oxygen and argon (80% oxygen), themaximum Texc reached about 6300 K at an average currentof 600 μA. Both the positive ions accumulation in thedischarge region and the increase of the local temperature aroundthe streamer channel caused by Joule heating are considered to bethe main reasons for the variations of Texc.
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