On the Mass Spectra of Hydrogen and Deuterium

On the basis of reasonable assumptions with regard to the probabilities of electron-impact induced transitions of hydrogen and deuterium, it is calculated that the relative intensity of H+ in the mass spectrum of hydrogen should be 2.3 times greater than that of D+ in the mass spectrum of deuterium for ionization by electrons of less than 35-volt energy. This value is compared with experimental values 2.8 (22-v energy), 1.5 (30-v energy), 1.9 (50-v energy), and 2.2 (100-v energy).