Abstract
Side-on observations were performed on a Stark-broadened He(II) 4686Å line emitted from a pulsed, high-current arc plasma preionized by CW microwave radiation at atmospheric pressure. A two-dimensional, multichannel detection method was used to obtain the radial distribution of the line profile in a single test. The line was emitted from the central hot core of the plasma, which had a homogeneous radial electron-density distribution. Comparisons with theoretical predictions show that the inclusion of ion-dynamic effects leads to better agreement between experiment and theory.
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