Preprint

PUBDB-2026-00146

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Optical transitions near the elusive 5s-4f level crossing in highly charged osmium with sensitivity to physics beyond the standard model

Rehbehn, N.-H. ; Sajith, L. P. K. ; Rosner, M. K. ; Cheung, C. ; Porsev, S. G. ; Safronova, M. S. ; Worm, S.DESY* ; Budker, D. ; Pfeifer, T. ; Crespo López-Urrutia, J. R. ; Bekker, H. (Corresponding author)Extern*

2025

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Please use a persistent id in citations: doi:10.1103/p347-47ys  doi:10.3204/PUBDB-2026-00146

Report No.: arXiv:2509.06710

Abstract: Optical transitions in highly charged ions can be very sensitive to hypothetical beyond-the-standard-model phenomena. Those near the degeneracy due to the 5s-4f level crossing are especially promising. We present measurements of Os15,16,17+ ions at an electron beam ion trap and corresponding predictions of several transitions that show a high sensitivity to hypothetical fifth forces and possible violations of local Lorentz invariance. We found electric quadrupole transitions in Os16+, which are suitable for frequency metrology due to linewidths down to 44µHz. Our calculations show the need for including enough inner-shell excitations to avoid an overestimation of interconfiguration transition rates, which were too faint for detection at the present signal-to-noise ratio.

Note: 9 pages, 2 figures

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Contributing Institute(s):

1. Z_DET (Z_DET)
2. Centre f. Quantum Techno. a. Application (CQTA)

Research Program(s):

1. 622 - Detector Technologies and Systems (POF4-622) (POF4-622)

Experiment(s):

1. No specific instrument

Appears in the scientific report 2025

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; Published ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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Linked articles:

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Journal Article Rehbehn, N.-H. ; Sajith, L. P. K. ; Rosner, M. K. ; Cheung, C. ; Porsev, S. G. ; Safronova, M. S. ; Worm, S.DESY* ; Budker, D. ; Pfeifer, T. ; Crespo Lopez-Urrutia, J. R. (Corresponding author)Extern* ; Bekker, H. (Corresponding author)Extern*
Optical transitions near the elusive 5s-4f level crossing in highly charged osmium with sensitivity to physics beyond the standard model
Physical review / A 112(6), L061101 (2025) [10.1103/p347-47ys]2025     Files  Fulltext Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

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