Absolute cross section for photoionization of atomic oxygen

The absolute cross section for photoionization of atomic oxygen from the 2p⁴³P ground state of O⁰ to the 2p³⁴S ground state of O⁺ has been measured at five narrow wavelength intervals between 89.8 and 76.2 nm. The cross section near the 2p³⁴S threshold is 4.5 Mb ±{} 7%. Recent calculations by Taylor and Burke, and by Pradhan and Saraph are in reasonable agreement with this work. The dipole-length results of Taylor and Burke (4.1 Mb) are in better agreement with the experiment than their dipole-velocity results (3.2 Mb).