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

Togawa, M.; Kühn, S.; Shah, C.; Amaro, P.; Steinbrügge, R.; Stierhof, J.; Hell, N.; Rosner, M.; Fujii, K.; Bissinger, M.; Ballhausen, R.; Hoesch, M.; Seltmann, J.; Park, S.; Grilo, F.; Porter, F. S.; Santos, J. P.; Chung, M.; Stöhlker, T.; Wilms, J.; Pfeifer, T.; Brown, G. V.; Leutenegger, M. A.; Bernitt, S.; Crespo López-Urrutia, J. R.

doi:10.1103/PhysRevA.102.052831

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

Journal Article · Wed Nov 25 00:00:00 EST 2020 · Physical Review A

DOI:https://doi.org/10.1103/PhysRevA.102.052831· OSTI ID:1724267

;

; Steinbrügge, R.; Stierhof, J.; Hell, N.; Rosner, M.; Fujii, K.; Bissinger, M.; Ballhausen, R.; Hoesch, M.; Seltmann, J.; Park, S.; Grilo, F.; Porter, F. S.; Santos, J. P.; Chung, M.; Stöhlker, T.; Wilms, J. more »

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. Furthermore, some photoabsorption resonances of O⁵⁺ reveal strong two-electron–one-photon (TEOP) transitions. We find that for the [(1s2s)₁5p_3/2]_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 [(1s2p_3/2)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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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1724267

Alternate ID(s):: OSTI ID: 1841855

Report Number(s):: LLNL-JRNL-831016; PLRAAN; 052831

Journal Information:: Physical Review A, Journal Name: Physical Review A Vol. 102 Journal Issue: 5; ISSN 2469-9926

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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

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