A previous Breit-Pauli R-matrix calculation for photoionization of the excited initial state (6s6p) 1 P 1 o of atomic barium (Bartschat and McLaughlin, 1990) has been extended over a wide range of energies and various final ionic states. The complicated resonance structure was fully resolved and has been analysed in terms of quantum defect theory. While the agreement of this fully ab initio calculation with other recent theoretical and experimental work is quite satisfactory, the use of a semi-empirical core potential may be necessary to further improve the agreement between experimental and theoretical resonance positions.
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Bartschat et al. (1991) studied this question.
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