Abstract
A DIRECT determination of the average number of pairs of ions produced by a slow electron of given initial velocity during its complete absorption in a gas has been made possible by the use of high-speed pumps. Electrons are accelerated from a tungsten filament and passed through a capillary tube into an ionisation chamber containing gas at a suitable pressure, the gas issuing from the capillary being removed fast enough to maintain a good vacuum near the filament. The number of electrons entering the ionisation chamber is measured by a movable Faraday cylinder placed inside the chamber very close to the end of the capillary; then after the cylinder has been removed from the path of the beam, the ionisation produced in the gas is determined in the usual way.
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LEHMANN, J., OSGOOD, T. The Ionisation produced in Air during the complete Absorption of Slow Electrons. Nature 116, 242 (1925). https://doi.org/10.1038/116242a0
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DOI: https://doi.org/10.1038/116242a0
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