5min:

SCOTT R. BROZELL AND RUSSELL M. PITZER, Department of Chemical Physics, The Ohio State University, Columbus, OH 43210.

Spin-orbit configuration-interaction calculations are performed on U⁴⁺. Uranium is modeled with relativistic effective core potentials and Gaussian cc-pVDZ and cc-pVTZ basis sets. This 5f² ion has been studied extensively, and the calculations are compared with the experimental spectrum.