Electronic structure and magnetic properties of the neptunyl ion

Abstract

The magnetic and spectroscopic properties of the neptunyl ion are reconsidered. The effect on the energy levels of covalency is discussed. New values for the parameters of our earlier theory are obtained, the analysis being based on more recent spectroscopic data and arguments concerning the relative widths and intensities of the optical absorption peaks, g-values and the temperature independent susceptibility are calculated and the results compared with experimental values. Experiments which need to be done to confirm various parts of the theory are suggested.