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Prominent role of multielectron processes in K -shell double and triple photodetachment of oxygen anions
- Source :
- Physical review / A 94(4), 041401 (2016). doi:10.1103/PhysRevA.94.041401
- Publication Year :
- 2016
- Publisher :
- APS, 2016.
-
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.<br />Comment: 5 pages, 2 figures
- Subjects :
- Physics
Electron density
Atomic Physics (physics.atom-ph)
Electron shell
FOS: Physical sciences
Synchrotron light source
Photon energy
01 natural sciences
Physics - Atomic Physics
Shakedown
Ion
Ionization
0103 physical sciences
ddc:530
Atomic physics
010306 general physics
Valence electron
010303 astronomy & astrophysics
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- Physical review / A 94(4), 041401 (2016). doi:10.1103/PhysRevA.94.041401
- Accession number :
- edsair.doi.dedup.....5fc47604c0c6c76b624f16a497a90120