Theoretical Multiplet Strengths for Mg I, Al II, and Si III

Abstract

Superposition of configurations wavefunctions have been computed for the ground state and some lower excited states of the first three members of the magnesium isoelectronic sequence. The excited states are all those with configurations involving the low‐lying orbitals 3s, 3p, 3d, and 4s. Multiplet strengths were also computed for all the allowed electric dipole transitions among these states. Only excitations of the outer two valence electrons were included in the multiconfiguration expansion, with the virtual orbitals being derived from a pseudonatural orbital transformation. Comparisons are made with predictions of the Z‐expansion method.