Abstract
IN the course of some investigations on arc discharges with oxide-coated cathodes in rare gases, a new dark sheath with a sharp boundary was seen between the well-known Langmuir double space-charge sheath on the cathode and the light of the arc plasma. Fig. 1 shows diagrammatically (a) the cylindrical (indirectly heated) barium–strontium oxide coated cathode (viewed end-on), with (b) the well-known absolutely dark space-charge sheath, a few tenths of a millimetre in width and concentric with it, and (c) the almost dark sheath a few millimetres wide, followed by (d) the light of the plasma.
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WARMOLTZ, N. A Second Sheath near the Cathode of an Arc Discharge. Nature 138, 36 (1936). https://doi.org/10.1038/138036b0
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DOI: https://doi.org/10.1038/138036b0
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