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The efficiencies of ionization of N₂, CO, O₂, NO, H₂ and C₂H₂ 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: N₂, 15. 7; CO, 14. 1; O₂, 12. 5 and 16. 1; NO, 9. 5; H₂, 15. 6; and C₂H₂, 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 C₂H₂. None were observed in H₂ or N₂.
Tate et al. (1932) studied this question.