Abstract
Investigations of the near-cathode region of the atmospheric pressure, 200 A arc burning in pure argon have been performed using spectroscopic techniques. Several slices at different distances from the cathode tip have been observed side-on. In order to perform diagnostic measurements of the plasma, the profiles of the Ar I and Ar II lines have been recorded. Phenomena inexplicable in terms of the model based on assumption of a local thermodynamic equilibrium state and constant pressure in the plasma have been observed and are shown on an Olsen-Richter diagram.
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