The Efficiencies of Ionization and Ionization Potentials of Various Gases Under Electron Impact

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The efficiencies of ionization of N₂, CO, O₂, NO, H₂ and C₂{H}₂$ by electron impact have been measured. The curves are similar to those of He, Ne, A and Hg vapor. The ionization potentials of the molecules were found to be: ${N}₂$, 15.7; CO, 14.1; ${O}₂$, 12.5 and 16.1; NO, 9.5; ${H}₂$, 15.6; and ${C}₂H₂, 11.6. The probable error in each case is about a tenth of a volt. Negative ions were formed by electron impact in NO, CO, O₂ and C₂{H}₂$. None were observed in ${H}₂$ or ${N}₂$.