Data are presented for the relative photoabsorption cross section of Ba I near the 5p-5d 'giant resonance'. A new interpretation is proposed for the peak at 581 AA in the Ba 2+ /Ba + ratio, which resolves a number of difficulties. Coupling between two-step autoionisation and many-body processes leads to an asymmetric Fano profile of a novel kind in the double ionisation spectrum.
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Connerade et al. (1980) studied this question.
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