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Photoionization cross sections for all subshells occupied in the ground states of neutral oxygen and each positive ion O⁺ⁿ (n=1-6) have been calculated using Hartree-Slater wave functions. The results show that removal of a $2p$ or $2s$ electron has no effect on the $1s$ cross section other than shifting the threshold. The systematics of the cross section as a function of stage of ionization are analyzed, and the limits of applicability of the hydrogenic model are discussed.
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Missavage et al. (1977) studied this question.
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