The 5d7s¹D₂ state of barium was resonantly prepared and photoionized. Branching ratios and photoelectron angular distributions were measured for the $6s$ and $5d$ core states of Ba.⁺ Strong configuration mixing is indicated for the 5d7s¹D₂ state. The $6s$ core is produced in 43% of the ionization events, and the $5d$-core photoelectron angular distributions show fourth and sixth spherical harmonics in violation of independent-particle predictions.
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Mullins et al. (1985) studied this question.
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