A fully relativistic ab-initio multiconfiguration Dirac-Fock (m.D.-F.) procedure has been used to identify six prominent peaks in the 5p electron-impact ionization spectrum of Bai and thereby also suggest assignments for each series limit in the 5p-photoabsorption (synchrotron radiation) spectrum of Ba I. Comparison between single configuration m.D.-F. and non-relativistic H.—F. intermediate coupling calculations show differences in the predicted ordering of levels; triple manifold m.D.-F. calculations show the interaction between configurations 5p5 6s2, 5p5 5d 6s and 5p5 5d2 of Ba II to be responsible for the prominence of supernumerary excitations in each experiment.
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Rose et al. (1980) studied this question.
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