Journal
PHYSICAL REVIEW A
Volume 106, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.106.013114
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Funding
- Bundesministerium fur Bildung und Forschung within the Verbundforschung funding scheme [05K19GU3, 05K19RG3]
- Deutsche Forschungsgemeinschaft (DFG) [389115454, SFB925/A3]
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Experimental cross sections for m-fold photodetachment of oxygen anions were measured and showed clear signatures of direct double detachment. Theoretical calculations and large-scale cascade calculations were performed to study the subsequent de-excitation cascades.
Experimental cross sections for m-fold photodetachment (m = 2-5) of oxygen anions via K-shell excitation and ionization were measured in the photon-energy range of 525-1500 eV using the photon-ion merged-beams technique at a synchrotron light source. The measured cross sections exhibit clear signatures of direct double detachment, including double K-hole creation. The shapes of the double-detachment cross sections as a function of photon energy are in accord with Pattard's [J. Phys. B 35, L207 (2002)] empirical scaling law. We have also followed the complex de-excitation cascades that evolve subsequently to the initial double-detachment events by systematic large-scale cascade calculations. The resulting theoretical product charge-state distributions are in good agreement with the experimental findings.
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