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

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

doi:10.1103/PhysRevA.102.052831

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

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. WilmsT. Pfeifer, G. V. Brown, M. A. Leutenegger, S. Bernitt, J. R. Crespo López-Urrutia

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Abstract

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.

Original language	English
Article number	053109
Journal	Physical Review A
Volume	102
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevA.102.052831
State	Published - Nov 25 2020
Externally published	Yes

Funding

Financial support was provided by the Max-Planck-Gesellschaft and Bundesministerium für Bildung und Forschung through Project No. 05K13SJ2. We acknowledge DESY (Hamburg, Germany), a member of the Helmholtz Association HGF, for the provision of experimental facilities. Parts of this research were carried out at PETRAIII. Work by C.S. was supported by the Deutsche Forschungsgemeinschaft Project No. 266229290 and by an appointment to the NASA Postdoctoral Program at the NASA Goddard Space Flight Center, administered by Universities Space Research Association under contract with NASA. P.A. acknowledges support from Fundação para a Ciência e a Tecnologia, Portugal, under Grant No. UID/FIS/04559/2020(LIBPhys) and under Contract No. SFRH/BPD/92329/2013. Work at UNIST was supported by the National Research Foundation of Korea (Grant No. NRF-2016R1A5A1013277). Work at LLNL was performed under the auspices of the U.S. Department of Energy under Contract No. DE-AC52-07NA27344 and supported by NASA grants to LLNL. M.A.L. and F.S.P. acknowledge support from NASA's Astrophysics Program.

Funders	Funder number
NRF-2016R1A5A1013277
Universities Space Research Association
U.S. Department of Energy	DE-AC52-07NA27344
National Aeronautics and Space Administration
Deutsche Forschungsgemeinschaft	266229290
Fundação para a Ciência e a Tecnologia	UID/FIS/04559/2020, SFRH/BPD/92329/2013
Bundesministerium für Bildung und Forschung	05K13SJ2
National Research Foundation of Korea
Max-Planck-Gesellschaft

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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., ... Crespo López-Urrutia, J. R. (2020). Observation of strong two-electron-one-photon transitions in few-electron ions. Physical Review A, 102(5), Article 053109. https://doi.org/10.1103/PhysRevA.102.052831

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title = "Observation of strong two-electron-one-photon transitions in few-electron ions",

abstract = "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.",

author = "M. Togawa and S. K{\"u}hn and C. Shah and P. Amaro and R. Steinbr{\"u}gge and J. Stierhof and N. Hell and M. Rosner and K. Fujii and M. Bissinger and R. Ballhausen and M. Hoesch and J. Seltmann and S. Park and F. Grilo and Porter, {F. S.} and Santos, {J. P.} and M. Chung and T. St{\"o}hlker and J. Wilms and T. Pfeifer and Brown, {G. V.} and Leutenegger, {M. A.} and S. Bernitt and {Crespo L{\'o}pez-Urrutia}, {J. R.}",

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year = "2020",

month = nov,

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doi = "10.1103/PhysRevA.102.052831",

language = "English",

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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, FS, Santos, JP, Chung, M, Stöhlker, T, Wilms, J, Pfeifer, T, Brown, GV, Leutenegger, MA, Bernitt, S & Crespo López-Urrutia, JR 2020, 'Observation of strong two-electron-one-photon transitions in few-electron ions', Physical Review A, vol. 102, no. 5, 053109. https://doi.org/10.1103/PhysRevA.102.052831

TY - JOUR

T1 - Observation of strong two-electron-one-photon transitions in few-electron ions

AU - Togawa, M.

AU - Kühn, S.

AU - Shah, C.

AU - Amaro, P.

AU - Steinbrügge, R.

AU - Stierhof, J.

AU - Hell, N.

AU - Rosner, M.

AU - Fujii, K.

AU - Bissinger, M.

AU - Ballhausen, R.

AU - Hoesch, M.

AU - Seltmann, J.

AU - Park, S.

AU - Grilo, F.

AU - Porter, F. S.

AU - Santos, J. P.

AU - Chung, M.

AU - Stöhlker, T.

AU - Wilms, J.

AU - Pfeifer, T.

AU - Brown, G. V.

AU - Leutenegger, M. A.

AU - Bernitt, S.

AU - Crespo López-Urrutia, J. R.

PY - 2020/11/25

Y1 - 2020/11/25

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=85096898421&partnerID=8YFLogxK

U2 - 10.1103/PhysRevA.102.052831

DO - 10.1103/PhysRevA.102.052831

M3 - Article

AN - SCOPUS:85096898421

SN - 2469-9926

VL - 102

JO - Physical Review A

JF - Physical Review A

IS - 5

M1 - 053109

ER -

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

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