Energies, transition rates, and electron electric dipole moment   enhancement factors for Ce IV and Pr V
  Energies, transition rates, and electron electric dipole moment (EDM) enhancement factors are calculated for low-lying states of Ce IV and Pr V using relativistic many-body perturbation theory. This study is related to recent investigations of the more complicated Gd IV ion, which is promising for electron EDM experiments. The ions Ce IV and Pr V both have a single valence electron, permitting one to carry out reliable ab-initio calculations of energy levels, transition rates and other atomic properties using well developed computational methods. 
I. M. Savukov, W. R. Johnson, U. I. Safronova, and M. S. Safronova