Observation of strong two-electron--one-photon transitions in few-electron ion
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arXiv
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2020
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| author | Togawa, Moto Kühn, Steffen Shah, Chintan Amaro, Pedro Steinbrügge, René Stierhof, Jakob Hell, Natalie Rosner, Michael Fujii, Keisuke Bissinger, Matthias Ballhausen, Ralf Hoesch, Moritz Seltmann, Jörn Park, SungNam Grilo, Filipe Porter, F. Scott Santos, José Paulo Chung, Moses Stöhlker, Thomas Wilms, Jörn Pfeifer, Thomas Brown, Gregory V. Leutenegger, Maurice A. Bernitt, Sven López-Urrutia, José R. Crespo |
| author_facet | Togawa, Moto Kühn, Steffen Shah, Chintan Amaro, Pedro Steinbrügge, René Stierhof, Jakob Hell, Natalie Rosner, Michael Fujii, Keisuke Bissinger, Matthias Ballhausen, Ralf Hoesch, Moritz Seltmann, Jörn Park, SungNam Grilo, Filipe Porter, F. Scott Santos, José Paulo Chung, Moses Stöhlker, Thomas Wilms, Jörn Pfeifer, Thomas Brown, Gregory V. Leutenegger, Maurice A. Bernitt, Sven López-Urrutia, José R. Crespo |
| contents | We resonantly excite the $K$ series of O$^{5+}$ and O$^{6+}$ 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 O$^{5+}$ reveal strong two-electron--one-photon (TEOP) transitions. We find that for the $[(1s\,2s)_1\,5p_{3/2}]_{3/2;1/2}$ 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 $[(1s\,2p_{3/2})_1\,4s]_{3/2;1/2}$ 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2003_05965 |
| institution | arXiv |
| publishDate | 2020 |
| record_format | arxiv |
| spellingShingle | Observation of strong two-electron--one-photon transitions in few-electron ion Togawa, Moto Kühn, Steffen Shah, Chintan Amaro, Pedro Steinbrügge, René Stierhof, Jakob Hell, Natalie Rosner, Michael Fujii, Keisuke Bissinger, Matthias Ballhausen, Ralf Hoesch, Moritz Seltmann, Jörn Park, SungNam Grilo, Filipe Porter, F. Scott Santos, José Paulo Chung, Moses Stöhlker, Thomas Wilms, Jörn Pfeifer, Thomas Brown, Gregory V. Leutenegger, Maurice A. Bernitt, Sven López-Urrutia, José R. Crespo Atomic Physics High Energy Astrophysical Phenomena Plasma Physics We resonantly excite the $K$ series of O$^{5+}$ and O$^{6+}$ 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 O$^{5+}$ reveal strong two-electron--one-photon (TEOP) transitions. We find that for the $[(1s\,2s)_1\,5p_{3/2}]_{3/2;1/2}$ 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 $[(1s\,2p_{3/2})_1\,4s]_{3/2;1/2}$ 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. |
| title | Observation of strong two-electron--one-photon transitions in few-electron ion |
| topic | Atomic Physics High Energy Astrophysical Phenomena Plasma Physics |
| url | https://arxiv.org/abs/2003.05965 |