Abstract
The study of the CW discharge of atmospheric pressure, supported by focused sub-terahertz radiation, is performed. The electron density of the plasma torch measured by the Stark broadening of the Balmer series of hydrogen lines. Plasma density was close to 2×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">15</sup> cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">−3</sup> . This exceeds the cut-off value for the frequency of the heating radiation. The electron temperature determined by relative intensities of the argon atomic emission lines. The values of the electron temperature were in the range from 1 to 2 eV.
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