Multiple photodetachment of oxygen anions via K-shell excitation and 
ionization: Direct double-detachment processes and subsequent deexcitation 
cascades

Schippers, S.; Hamann, A.; Perry-Sassmannshausen, A.; Buhr, T.; Müller, A.; Martins, M.; Reinwardt, S.; Trinter, Florian; Fritzsche, S.

doi:10.1103/PhysRevA.106.013114

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Multiple photodetachment of oxygen anions via K-shell excitation and ionization: Direct double-detachment processes and subsequent deexcitation cascades

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Trinter, Florian
Molecular Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Schippers, S., Hamann, A., Perry-Sassmannshausen, A., Buhr, T., Müller, A., Martins, M., et al. (2022). Multiple photodetachment of oxygen anions via K-shell excitation and ionization: Direct double-detachment processes and subsequent deexcitation cascades. Physical Review A, 106(1): 013114. doi:10.1103/PhysRevA.106.013114.

Cite as: https://hdl.handle.net/21.11116/0000-000A-DF69-6

Abstract

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.