Observation of strong two-electron–one-photon transitions in few-electron ions
| Autor: | Gregory V. Brown, Jörn Seltmann, Moritz Hoesch, Chintan Shah, SungNam Park, Sven Bernitt, Thomas Pfeifer, Maurice A. Leutenegger, Pedro Amaro, Ralf Ballhausen, Keisuke Fujii, Thomas Stöhlker, F. Grilo, Moto Togawa, M. Chung, Natalie Hell, F. S. Porter, Steffen Kühn, Jörn Wilms, José Paulo Santos, Michael Rosner, Jakob Stierhof, René Steinbrügge, M. Bissinger, J. R. Crespo López-Urrutia |
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| Přispěvatelé: | DF – Departamento de Física, LIBPhys-UNL |
| Rok vydání: | 2020 |
| Předmět: |
High Energy Astrophysical Phenomena (astro-ph.HE)
Physics Photon Atomic Physics (physics.atom-ph) Relaxation (NMR) Radiative decay FOS: Physical sciences Electron 01 natural sciences Physics - Plasma Physics Atomic and Molecular Physics and Optics Physics - Atomic Physics 010305 fluids & plasmas 3. Good health Auger Ion Plasma Physics (physics.plasm-ph) 0103 physical sciences Principal quantum number ddc:530 Atomic physics Astrophysics - High Energy Astrophysical Phenomena 010306 general physics Electronic energy |
| Zdroj: | Physical review / A 102(5), 052831 (2020). doi:10.1103/PhysRevA.102.052831 |
| ISSN: | 2469-9934 2469-9926 |
| Popis: | 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 $K\alpha$ 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. Comment: Published in PRA |
| Databáze: | OpenAIRE |
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