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  Prominent role of multielectron processes in K-shell double and triple photodetachment of oxygen anions.

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): 041401(R). doi:10.1103/PhysRevA.94.041401.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-BED2-7 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-19AD-B
Genre: Journal Article

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2364306.pdf (Publisher version), 218KB
 
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Schippers, S., Author
Beerwerth, R., Author
Abrok, L., Author
Bari, S.1, Author              
Buhr, T., Author
Martins, M., Author
Ricz, S., Author
Viefhaus, J., Author
Fritzsche, S., Author
Müller, A., Author
Affiliations:
1Research Group of Structural Dynamics of (Bio)Chemical Systems, MPI for Biophysical Chemistry, Max Planck Society, ou_578564              

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 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 1s2s22p6 S2 resonance as well as the positions of the 1s2s22p5 P3 and 1s2s22p5 P1 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.

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Language(s): eng - English
 Dates: 2016-10-062016-10
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevA.94.041401
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Title: Physical Review A
Source Genre: Journal
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Pages: 5 Volume / Issue: 94 (4) Sequence Number: 041401(R) Start / End Page: - Identifier: -