Correlation Effects in Complex Spectra. II. Transition Probabilities for the Magnesium Isoelectronic Sequence

Abstract

Absolute multiplet strengths have been calculated for electric dipole transitions involving the ground state and/or several lower‐lying excited‐state configurations of Mg I, Al II, Si III, P IV and Ca IX. Configuration mixing is taken into account by using linear combinations of Hartree—Fock—Slater (HFS) determinantal wavefunctions. Dipole length and dipole velocity expressions for the transition probability are evaluated, and in most cases these alternative formulations agree to within 25% of each other. Three modifications of the ``universal'' exchange potential used in the HFS self‐consistent field method are investigated, and the differences in the calculated transition probabilities are found to be quite small, with perhaps a slight preference for the variational adjustment proposed by Lindgren. Calculated absolute multiplet strengths are compared with the available experimental measurements, and with other calculations.