Twenty-four unknown U ii energy levels are classified according to configuration using pattern-recognition methods. The energy level, Landé g factor, quantum number J, and ${}_{}{}^{234}{}_{}{}^{}\mathrm{U}$ isotope shift are used to describe each level. Preliminary results of the prediction of the extent of configuration mixing for low-energy odd levels are presented.

• Received 31 March 1988

DOI:https://doi.org/10.1103/PhysRevA.38.3773