THE K-SHELL AUGER DECAY OF ATOMIC OXYGEN

Relative photoionization cross sections for O+ and O2+ produced by the Auger decay of a 1s hole in atomic oxygen were measured by using sync hrotron radiation between 525 and 553 eV. Energies and quantum defects of the members of the two Rydberg series converging to [1s]2s(2)2p(4) ((4)p) and [1s]2s(2)2p(4)(P-2) ionization thresholds were determined. In addition, the P-2 and P-4 ionization thresholds were calculated fro m the two Rydberg series. The 182 meV resolution of the monochromator allowed a detailed study over both thresholds revealing evidence for p ost-collision interaction and allowing a comparison of the ionization continuum above both P-2 and P-4 thresholds with that of the ionizatio n continuum above the Ar L2-3 edges. This comparison indicates that th e lifetimes of the Ar(2p) and O(1s) hole states are approximately the same.