Energies of 1s22lq (1 ⩽ q ⩽ 8) states for Z ⩽ 60 with a combined configuration interaction and many-body perturbation theory approach

Using a combined configuration interaction and many-body perturbation theory approach, we calculate the level energies of 1s22lq (1 ⩽ q ⩽ 8) states for ions with Z ⩽ 60. Comparison with experimental results wherever available indicates that the calculated energies are accurate to within a few 1000 cm−1 for all ions except for near-neutral systems which are less than 2-3 times ionized. The ground state ionization energies of these ions are also reported and compared with experimental values.