SERIES PERTURBATIONS AND ATOMIC OSCILLATOR STRENGTHS-2D SERIES OF AL1

A model calculation has been made of the effects of perturbations of the 3s2nd series of aluminum by the 3s3p2D2 term. The model employed is the traditional one of configuration interaction among the independent-particle model representations of the relevant discrete states, with Hartree-Fock functions being used to compute the necessary matrix elements. It is found that, while in the Hartree-Fock approximation the 3s3p2 term is bound and embedded in the 3s2nd series, the configuration interaction gives rise to a new autoionizing state just beyond the series limit. This state, which is approximately 50% 3s3p2, is found to have most of the D2 absorption oscillator strength (f=1.1). The general properties of this model of series perturbations are also discussed in some detail. © 1969 The American Physical Society.