E-paper

Publication year: 2016

Journal: arXiv

DOI Link: https://doi.org/10.48550/arXiv.1609.05309

Publisher: Arxiv.org

Abstract: 

The photon-ion merged-beams technique was used at a synchrotron light source for measuring absolute cross sections of 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 2s2 2p6 2S resonance as well as the positions of the 1s 2s2 2p5 3P and 1s 2s2 2p5 1P thresholds for K-shell ionization were determined with high precision. In addition, systematically enlarged multi-configuration 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 shake-up (and -down) 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 multi-electron processes in K-shell double and triple photodetachment of oxygen anions [Preprint]. arXiv, Article 1609.05309. https://doi.org/10.48550/arXiv.1609.05309

APA Citation style: Schippers, S., Beerwerth, R., Abrok, L., Bari, S., Buhr, T., Martins, M., Ricz, J., Viefhaus, S., Fritzsche, S., & Müller, A. (2016). Prominent role of multi-electron processes in K-shell double and triple photodetachment of oxygen anions. arXiv. https://doi.org/10.48550/arXiv.1609.05309