New data on the Ba photoabsorption spectrum in the region of 5p-subshell excitation are presented and compared with Ba 2+ /Ba + production rates. It is shown that step one of the two-step autoionisation mechanism is different from the excitation scheme which was originally proposed. Furthermore, an energy condition is deduced from the observations, and provides new insight into the two-step mechanism.
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Connerade et al. (1983) studied this question.
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