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@ARTICLE{Rehbehn:643340,
      author       = {Rehbehn, Nils-Holger and Sajith, Lakshmi Priya
                      Kozhiparambil and Rosner, Michael K. and Cheung, Charles and
                      Porsev, Sergey G. and Safronova, Marianna S. and Worm,
                      Steven and Budker, Dmitry and Pfeifer, Thomas and Crespo
                      López-Urrutia, José R. and Bekker, Hendrik},
      title        = {{O}ptical transitions near the elusive 5s-4f level crossing
                      in highly charged osmium with sensitivity to physics beyond
                      the standard model},
      issn         = {2469-9934},
      reportid     = {PUBDB-2026-00146, arXiv:2509.06710},
      year         = {2025},
      note         = {9 pages, 2 figures},
      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.},
      cin          = {$Z_DET$ / CQTA},
      ddc          = {530},
      cid          = {$I:(DE-H253)Z_DET-20201126$ / I:(DE-H253)CQTA-20221102},
      pnm          = {622 - Detector Technologies and Systems (POF4-622)},
      pid          = {G:(DE-HGF)POF4-622},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {2509.06710},
      howpublished = {arXiv:2509.06710},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2509.06710;\%\%$},
      doi          = {10.1103/p347-47ys},
      url          = {https://bib-pubdb1.desy.de/record/643340},
}