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Experimental cross sections for m-fold photodetachment (m=2-5) of oxygenanions via K-shell excitation and ionization were measured in the photon-energyrange of 525-1500 eV using the photon-ion merged-beams technique at asynchrotron light source. The measured cross sections exhibit clear signaturesof direct double detachment, including double K-hole creation. The shapes ofthe double-detachment cross sections as a function of photon energy are inaccord with Pattard's [J. Phys. B 35, L207 (2002)] empirical scaling law. Wehave also followed the complex deexcitation cascades that evolve subsequentlyto the initial double-detachment events by systematic large-scale cascadecalculations. The resulting theoretical product charge-state distributions arein good agreement with the experimental findings.

physical review. a/physical review, a

Multiple Photodetachment of Oxygen Anions via K-Shell Excitation and  Ionization: Direct Double-Detachment Processes and Subsequent Deexcitation  Cascades