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Photoionization Study of the 2<i>s<sup>2</sup>2p<sup>2</sup> (<sup>1</sup>D)ns(<sup>2</sup>D), 2s<sup>2</sup>2p<sup>2</sup> (<sup>1</sup>D)nd(<sup>2</sup>P), 2s<sup>2</sup>2p<sup>2</sup> (<sup>1</sup>D)nd(<sup>2</sup>S), 2s<sup>2</sup>2p<sup>2</sup> (<sup>1</sup>S)nd<sup>2</sup>D</i>, and <i>2s<sup>2</sup>2p<sup>3</sup> (<sup>3</sup>P)np(<sup>2</sup>D)</i> Rydberg Series of O+ Ions via the Modified Atomic Orbital Theory — Oak Academic Publishing