Abstract
Energy distributions of electrons in beams from hollow-anode gas discharge electron guns have been determined for electron flight paths of 0·1, 0·3 and 0·6 m. Guns have been operated at potentials between 5 kV and 20 kV in hydrogen, helium, oxygen, air, nitrogen and argon at pressures in the approximate range 10-100 N m−2. A typical spectrum obtained has a sharp peak at an energy equivalent to that achieved by electrons accelerated to the full cathode potential. A second peak of amplitude 0·05-0·5 times the primary peak amplitude occurs at an energy lower by approximately one ionization potential. This secondary peak is broader, the amplitude falling to approximately zero within an energy range of about 100 eV.
Published Version
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