Relativistic many-body calculations of energies of n=2 states for boronlike ions

Energies of the fifteen (2l2${\mathit{l}}^{\prime }$2${\mathit{l}}^{\mathrm{″}}$) states for boronlike ions with Z = 5–100 are evaluated to second order in relativistic many-body perturbation theory. Second-order Coulomb and Breit-Coulomb interactions are included. Corrections are made to lowest order for the frequency-dependent Breit interaction and for the Lamb shift. A detailed discussion of the various contributions to the energy levels is given for boronlike iron (Z=26). Comparisons of the calculated energy levels with available experimental data are made for the entire sequence. © 1996 The American Physical Society.