Journal article

Publication year: 2016

Journal: Physical review A

Volume number: 94

Issue number: 4

ISSN: 2469-9926

eISSN: 2469-9934

Open access status: Green

DOI Link: https://doi.org/10.1103/PhysRevA.94.041401

Publisher: American Physical Society

Abstract: 
The photon-ion merged-beam technique was used at a synchrotron light source for measuring the absolute cross sections of the double and triple photodetachment of O- ions. The experimental photon energy range of 524-543 eV comprised the threshold for K-shell ionization. Using resolving powers of up to 13 000, the position, strength, and width of the below-threshold 1s 2s(2) 2p(6) (2) S resonance as well as the positions of the 1s 2s(2) 2p(5) (3) P and 1s 2s(2) 2p(5) (1) P thresholds for K-shell ionization were determined with high precision. In addition, systematically enlarged multiconfiguration Dirac-Fock calculations have been performed for the resonant detachment cross sections. Results from these ab initio computations agree very well with the measurements for the widths and branching fractions for double and triple detachment, if double shakeup (and shakedown) of the valence electrons and the rearrangement of the electron density is taken into account. For the absolute cross sections, however, a previously found discrepancy between measurements and theory is confirmed.

Harvard Citation style: Schippers, S., Beerwerth, R., Abrok, L., Bari, S., Buhr, T., Martins, M., et al. (2016) Prominent role of multielectron processes in K-shell double and triple photodetachment of oxygen anions, Physical review A, 94(4), Article 041401. https://doi.org/10.1103/PhysRevA.94.041401

APA Citation style: Schippers, S., Beerwerth, R., Abrok, L., Bari, S., Buhr, T., Martins, M., Ricz, S., Viefhaus, J., Fritzsche, S., & Müller, A. (2016). Prominent role of multielectron processes in K-shell double and triple photodetachment of oxygen anions. Physical review A. 94(4), Article 041401. https://doi.org/10.1103/PhysRevA.94.041401