Hartree-Fock, correlation and term energies of valence excited states of atoms and ions of the second row of the periodic table

Abstract

Hartree-Fock energies have been calculated for 333 valence states of atoms and ions of the second row of the periodic table corresponding to 1s²2s^m2pⁿ (m=0.1; 022s²2pⁿ)+b(1s²2pⁿ⁺²)). Relativistic contributions for the excited configurations were obtained approximately from computations of the relativistic energy of the 1s²2p⁶ 1S₀ and mately from computations of the relativistic energy of the 1s²2p^{6 1}S₀ and 1s²2s²2p^{6 1}S₀ states. All the above calculations extend from the neutral atom up to Z=15 for the three-, four-, five- and six-electron series and up to Z=17 for the seven-, eight-, nine- and ten-electron series.