Abstract
IT has been found possible to draw a 10-milliampere current of positive hydrogen ions from a high-frequency discharge maintained at a pressure of about 10-3 mm. A self-sustained discharge cannot be maintained at this pressure with constant potentials even up to 20 kilo-volts, and it is thus possible to use constant potentials of this order to extract positive ions from the discharge and to focus them into a beam. The arrangement is shown in the accompanying diagram.
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THONEMANN, P. High-Frequency Discharge as an Ion Source. Nature 158, 61 (1946). https://doi.org/10.1038/158061a0
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DOI: https://doi.org/10.1038/158061a0
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