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A 25-state R-matrix calculation is performed to obtain photoionization cross-sections for transitions from the 1s22s22p23P ground state of the O III ion. Results are obtained for a range of photon energies, including those at which K-shell photoionization processes take place. We compare our results with those from previous calculations. Excellent agreement is obtained. We also consider resonances owing to transitions of a 1s electron excited into the 2p orbital and compare with a recent calculation.
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Olalla et al. (2002) studied this question.
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