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Photoionization of the Be-like O4 + ion: total and partial cross sections for the ground 2s2 1S and excited 2s2p 1, 3P states

Photoionization cross sections of the Be-like O4 + ion in the photon energy region from the first threshold up to the O5 + 3d threshold have been calculated using a non-iterative variational R-matrix method combined with multichannel quantum-defect theory for the ground 2s2 1S and excited 2s2p 1, 3P states. The partial cross sections are presented and the autoionizing resonance structures arising from the ground and excited states are identified and characterized. Our calculational results, which show excellent agreement between length and velocity gauges, are compared with the available experiment and previous calculations, and good agreement is found.