Multi-electron processes in K-shell double and triple photodetachment of oxygen anions

30th International Conference on Photonic, Electronic, and Atomic Collisions

Schippers, S.^1 ; Beerwerth, R.^2,3 ; Abrok, L.^4 ; Bari, S.^5,6 ; Martins, M.^8 ; Ricz, S.^4 ; Viefhaus, J.^7 ; Fritzsche, S.^2,3 ; Müller, A.^9

I. Physikalisches Institut, Justus-Liebig-Universität Gießen, Giessen

35392, Germany^1

Helmholtz-Institut Jena, Jena

07743, Germany^2

Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena, Jena

07743, Germany^3

Institute of Nuclear Research of the Hungarian Academy of Sciences, Debrecen

4026, Hungary^4

European XFEL GmbH, Schenefeld

22869, Germany^5

DESY Photon Science, FS-SCS, Hamburg

22607, Germany^6

DESY Photon Science, FS-PE, Hamburg

22607, Germany^7

Institut für Experimentalphysik, Universität Hamburg, Hamburg

22761, Germany^8

Institut für Atom-und Molekülphysik, Justus-Liebig-Universität Gießen, Giessen

35392, Germany^9

关键词: Ab initio calculations;    Absolute cross sections;    K-shell ionization;    Multielectron process;    Photon energy;    Synchrotron light source;    Theoretical calculations;    Triple photodetachment;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/875/3/022004/pdf
DOI  :  10.1088/1742-6596/875/3/022004

来源: IOP

【 摘 要 】

Synopsis Absolute cross sections for double and triple photodetachment of O-ions have been measured at photon energies around the threshold for K-shell ionization using the photon-ion merged-beams technique at a synchrotron light-source. In addition, corresponding large-scale ab-initio calculations were carried out at a level of complexity that has never been invoked before. From the comparison between experiment and theory it becomes apparent that the inclusion of multi-electron processes such as double shake-up in the theoretical calculations is crucial for the explanation of the experimental findings.