The Ionization of Mercury Vapor by Electron Impact

Quantitative measurements have been made of the total number of positive charges per electron per centimeter path at a definite pressure and temperature in mercury vapor as a function of the energy of the impacting electrons out to 750 volts. The maximum efficiency 19.40 occurs at about 85 volts."Ultra-ionization potentials" were found at 10.60, 10.76, 10.88, 11.06, 11.27, 11.40, 11.55, 11.70, 11.78, 11.92, 12.00, 12.06, 12.17, 12.28, 12.40, 12.77, 13.55, 18.20, 19.36, 20.40, and 29.50 volts. Most of these agree with those previously observed.