Semi-empirical prediction of the electron affinities of gaseous radicals

The valence-state promotion energies calculated by Hinze and Jaffe for both atoms and negative ions may be combined to predict electron affinities for atoms in specified valence states. These predicted electron affinities agree closely with the experimental electron affinities for radicals derived from the same valence states and substitution in the radical appears to have little effect. The electron affinities of a number of radicals not as yet studied are predicted.