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Observation of strong two-electron--one-photon transitions in few-electron ions

We resonantly excite the K series of O5+ and O6+ up to principal quantum number n=11 with monochromatic x rays, producing K-shell holes, and observe their relaxation by soft-x-ray emission. Some photoabsorption resonances of O5+ reveal strong two-electron-one-photon (TEOP) transitions. We find that...

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Hauptverfasser: Togawa, Moto (VerfasserIn) , Kühn, Steffen (VerfasserIn) , Shah, C. (VerfasserIn) , Amaro, P. (VerfasserIn) , Steinbrügge, R. (VerfasserIn) , Stierhof, J. (VerfasserIn) , Hell, N. (VerfasserIn) , Rosner, Michael (VerfasserIn) , Fujii, K. (VerfasserIn) , Bissinger, M. (VerfasserIn) , Ballhausen, R. (VerfasserIn) , Hoesch, M. (VerfasserIn) , Seltmann, J. (VerfasserIn) , Park, S. (VerfasserIn) , Grilo, F. (VerfasserIn) , Porter, F. S. (VerfasserIn) , Santos, J. P. (VerfasserIn) , Chung, M. (VerfasserIn) , Stöhlker, T. (VerfasserIn) , Wilms, J. (VerfasserIn) , Pfeifer, Thomas (VerfasserIn) , Brown, G. V. (VerfasserIn) , Leutenegger, M. A. (VerfasserIn) , Bernitt, S. (VerfasserIn) , Crespo López-Urrutia, José Ramon (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 25 November 2020
In: Physical review
Year: 2020, Jahrgang: 102, Heft: 5
ISSN:2469-9934
DOI:10.1103/PhysRevA.102.052831
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevA.102.052831
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevA.102.052831
Volltext
Verfasserangaben:M. Togawa, S. Kühn, C. Shah, P. Amaro, R. Steinbrügge, J. Stierhof, N. Hell, M. Rosner, K. Fujii, M. Bissinger, R. Ballhausen, M. Hoesch, J. Seltmann, S. Park, F. Grilo, F. S. Porter, J. P. Santos, M. Chung, T. Stöhlker, J. Wilms, T. Pfeifer, G. V. Brown, M. A. Leutenegger, S. Bernitt, J. R. Crespo López-Urrutia

MARC

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520 |a We resonantly excite the K series of O5+ and O6+ up to principal quantum number n=11 with monochromatic x rays, producing K-shell holes, and observe their relaxation by soft-x-ray emission. Some photoabsorption resonances of O5+ reveal strong two-electron-one-photon (TEOP) transitions. We find that for the [(1s2s)15p3/2]3/2;1/2 states, TEOP relaxation is by far stronger than the radiative decay and competes with the usually much faster Auger decay path. This enhanced TEOP decay arises from a strong correlation with the near-degenerate upper states [(1s2p3/2)14s]3/2;1/2 of a Li-like satellite blend of the He-like Kα transition. Even in three-electron systems, TEOP transitions can play a dominant role, and the present results should guide further research on the ubiquitous and abundant many-electron ions where electronic energy degeneracies are far more common and configuration mixing is stronger. 
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