The individual effect of the ground-state configuration interaction and the final-state intershell and interchannel interactions to the photoionization of the $3s$ and $3p$ electrons is studied in the vicinity of their respective Cooper minima. Channels of configurations corresponding to these many-body interactions are included in our study by extending a recently developed theory of atomic transitions. Our calculation has successfully removed the quantitative disagreement between the experimental measurements and earlier theoretical estimates.
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T. N. Chang (1978) studied this question.
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