%0 Journal Article
%A Rehbehn, Nils-Holger
%A Sajith, Lakshmi Priya Kozhiparambil
%A Rosner, Michael K.
%A Cheung, Charles
%A Porsev, Sergey G.
%A Safronova, Marianna S.
%A Worm, Steven
%A Budker, Dmitry
%A Pfeifer, Thomas
%A Crespo López-Urrutia, José R.
%A Bekker, Hendrik
%T Optical transitions near the elusive 5⁢𝑠−4⁢𝑓 level crossing in highly charged osmium with sensitivity to physics beyond the standard model
%J Physical review / A
%V 112
%N 6
%@ 2469-9926
%C Woodbury, NY
%I American Physical Society
%M PUBDB-2025-05742
%P L061101
%D 2025
%X Optical transitions in highly charged ions can be very sensitive to hypothetical beyond-the-standard-model phenomena. Those near the degeneracy due to the 5⁢𝑠−4⁢𝑓 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 44µ⁢Hz. 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%R https://link.aps.org/doi/10.1103/p347-47ys
%U https://bib-pubdb1.desy.de/record/642952