  Energies of (2s2 2p5 3l3l') and (2s 2p6 3l3l') states for sodiumlike ions
with Z =14--100 are evaluated to second order in relativistic many-body
perturbation theory starting from a neonlike Dirac-Fock potential. Second-order
Coulomb and Breit interactions are included. Correction for the
frequency-dependence of the Breit interaction is taken into account in lowest
order. The Lamb shift correction to energies is also included in lowest order.
Intrinsic particle-particle-hole contributions to energies are found to be
20-30% of the sum of one- and two-body contributions. Comparisons are made with
available experimental data. These calculations are presented as a theoretical
benchmark for comparison with experiment and theory.
