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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. Furthermore, 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.

Authors:
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Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1724267
Alternate Identifier(s):
OSTI ID: 1841855
Report Number(s):
LLNL-JRNL-831016
Journal ID: ISSN 2469-9926; PLRAAN; 052831
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Published Article
Journal Name:
Physical Review A
Additional Journal Information:
Journal Name: Physical Review A Journal Volume: 102 Journal Issue: 5; Journal ID: ISSN 2469-9926
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; Atom & ion trapping & guiding; Electron correlation calculations for atoms & ions; Electron-ion collisions; Laboratory studies of space & astrophysical plasmas; Space & astrophysical plasma; Synchrotron radiation facilities; Spectroscopy; X-ray emission spectroscopy

Citation Formats

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., and Crespo López-Urrutia, J. R. Observation of strong two-electron–one-photon transitions in few-electron ions. United States: N. p., 2020. Web. doi:10.1103/PhysRevA.102.052831.
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. Observation of strong two-electron–one-photon transitions in few-electron ions. United States. https://doi.org/10.1103/PhysRevA.102.052831
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., and Crespo López-Urrutia, J. R. Wed . "Observation of strong two-electron–one-photon transitions in few-electron ions". United States. https://doi.org/10.1103/PhysRevA.102.052831.
@article{osti_1724267,
title = {Observation of strong two-electron–one-photon transitions in few-electron ions},
author = {Togawa, M. and Kühn, S. and Shah, C. and Amaro, P. and Steinbrügge, R. and Stierhof, J. and Hell, N. and Rosner, M. and Fujii, K. and Bissinger, M. and Ballhausen, R. and Hoesch, M. and Seltmann, J. and Park, S. and Grilo, F. and Porter, F. S. and Santos, J. P. and Chung, M. and Stöhlker, T. and Wilms, J. and Pfeifer, T. and Brown, G. V. and Leutenegger, M. A. and Bernitt, S. and Crespo López-Urrutia, J. R.},
abstractNote = {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)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.},
doi = {10.1103/PhysRevA.102.052831},
journal = {Physical Review A},
number = 5,
volume = 102,
place = {United States},
year = {Wed Nov 25 00:00:00 EST 2020},
month = {Wed Nov 25 00:00:00 EST 2020}
}

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