Abstract

Dipolar electric radiative lifetimes are calculated in Mg iii by using a semiempirical method that associates the parametric procedure, the optimization of a central parametric potential, and a second-order calculation of the radial matrix elements of the transition operator. In contrast to previous applications of this method, all second-order contributions are taken into account. Two types of improvement are introduced, the contributions arising from the inner shells and p5-shell excitations and the contributions of the continuum. These contributions are shown to lead to a significant decrease in the discrepancies between dipole–length and dipole–velocity results. Furthermore, the sizes of the configuration interactions in the second-order corrections are far from negligible in most cases and can even contribute in an essential way.

© 1982 Optical Society of America

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