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Original version
Brünger, M. & Kock, M.: Electron Density Determination in an Are Plasma by Laser Interferometry. In: Zeitschrift für Naturforschung A 30 (1975), S. 1560-1562. DOI: https://doi.org/10.1515/zna-1975-1208
By means of a 2 λ-Michelson-Interferometer the electron density has been determined with a mean accuracy of 2% in the axis of a wall-stabilized arc which has been operated in Argon at atmospheric pressure in a range from 10 to 100 A. The measurements have been performed with He-Ne-lasers at wavelengths λ1=0.63 μ and λ2 = 1.15 μ.