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We report an experimental and theoretical study of the forced autoionization of the doubly excited Ba 5d7d (¹{D}₂) state which lies ~200{cm}^{{{-}}1}$ below the ${Ba}⁺$ 6${s}1/2$ ionization limit. In zero field the 5d7d state perturbs the 6snd ${(}¹$,3${D}₂$) series by configuration interaction. The essential notion of forced autoionization is that applying a field of >2.5 kV/cm converts the 6snd states into a Stark continuum and the 5d7d state appears as an autoionization resonance. In this study we compare the zero-field configuration-interaction parameters with those obtained for the interaction of the 5d7d state with the structureless {}m{}=1 field-induced continuum and find rather similar values, thus confirming the utility of forced autoionization as a spectroscopic tool. In addition, we report a systematic investigation of the interaction of the 5d7d state with the highly structured {}m{}=0 Stark continuum.
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Sandner et al. (1986) studied this question.
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