Abstract
SynopsisAbsolute cross sections for double and triple photodetachment of O− ions have been measured at photon energies around the threshold for K-shell ionization using the photon-ion merged-beams technique at a synchrotron light-source. In addition, corresponding large-scale ab-initio calculations were carried out at a level of complexity that has never been invoked before. From the comparison between experiment and theory it becomes apparent that the inclusion of multi-electron processes such as double shake-up in the theoretical calculations is crucial for the explanation of the experimental findings.
Highlights
triple photodetachment of O− ions were measured in the experimental photon energy range of 524–543 eV that comprised the threshold
1s 2s2 2p5 1P thresholds for K-shell ionization were determined with high-precision
systematically enlarged multi-configuration Dirac-Fock calculations have been performed for the resonant detachment cross sections by utilizing the MCDF method
Summary
Absolute cross sections of double and triple photodetachment of O− ions were measured in the experimental photon energy range of 524–543 eV that comprised the threshold for K-shell ionization [1].
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