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Electron correlation in the 4d hole state of Ba has been studied by comparing the experimental 4d^-1{→}6s^-2 Auger electron and 4d photoelectron spectrum with results based on the Bethe-Born approximation and relativistic multiconfiguration Dirac-Fock calculations. The 4d-hole-state correlation is found to result in a reversal of the 4d5/2:4d3/2 branching ratio in going from the photoelectron spectrum to the Auger spectrum in accordance with experimental results.
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Mäntykenttä et al. (1993) studied this question.
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