Spectral lines from the $3s-{3p}_{3/2}$ transitions in Na-like to P-like uranium have been measured at the Lawrence Livermore National Laboratory EBIT-I electron-beam ion trap facility. The measured x-ray energies are among the most accurate spectroscopic data available for highly charged heavy ions and provide important tests of relativistic atomic structure theory as well as bound-state quantum electrodynamic (QED) corrections in strong fields. Relativistic configuration-interaction (RCI) calculations based on the no-pair Hamiltonian with B-spline basis functions have been carried out to study these transitions. Our RCI energies, corrected by many-electron screened QED corrections also calculated here, yield theoretical results in very good agreement with experiment.

• Received 10 April 2003

DOI:https://doi.org/10.1103/PhysRevA.68.022507