Energy levels in the magnesium sequence, Mg I to Mn XIV, calculated in the multiconfiguration optimized potential model

The energies of a large number of low-lying levels in the atoms and ions of the magnesium isoelectronic sequence from Mg I to Mn XIV have been calculated in a configuration interaction calculation. The orbitals were determined as eigenfunctions of the one-particle Schroedinger equation for a central potential that is variationally optimized. A relativistic calculation using Breit approximation was carried out in the potensials calculated non-relativistically. The results are generally in good agreement with experiment, but a number of possible reassignments are suggested. Singlet-triplet separations important for forbidden transition rates and fine-structure intervals are also tabulated