Abstract
It has been possible to assign the 10 lowest energy levels of Am IV. By using these assignments and the complete spin—orbit matrices, a fit was obtained with 5f hydrogenic wavefunctions. This fit was then improved by using a fitting program and varying all four parameters. Comparison calculations using hydrogenic wavefunctions are made for Pu I. For Am IV the hydrogenic values are F 2=268.6 cm—1 and ζ=2605 cm—1; the corresponding values for Pu I are F 2=230.6 cm—1 and ζ=2174.6 cm—1.

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