Safronova, Marianna S.; Department of Physics and Astronomy, University of Delaware, Newark, Delaware, USA
Crespo López-Urrutia, José R.; Max-Planck-Institut für Kernphysik, Heidelberg, GERMANY
Schmidt, Piet O.; QUEST Institute for Experimental Quantum Metrology, PTB-Braunschweig; Leibniz Universität, Institut für Quantenoptik, Hannover, GERMANY
We measured the 𝑔-factor of the excited-state 3 P1 in Ca14+ ion to be 𝑔 =1.499032(6) with a relative uncertainty of 4 ×10−6. The magnetic field magnitude is derived from the Zeeman splitting of a Be+ ion, cotrapped in the same linear Paul trap as the highly charged Ca14+ ion. Furthermore, we experimentally determined the second-order Zeeman coefficient 𝐶2 of the 3 P0 −3 P1 clock transition. For the 𝑚𝐽 =0 →𝑚𝐽′ =0 transition, we obtained 𝐶2=0.39±0.04 Hz mT−2, which is to our knowledge the smallest reported for any atomic transition to date. This confirms the predicted low sensitivity of highly charged ions to higher-order Zeeman effects, making them ideal candidates for high-precision optical clocks. Comparison of the experimental results with our state-of-the art electronic structure calculations shows good agreement and demonstrates the significance of the frequency-dependent Breit contribution, negative energy states, and QED effects on magnetic moments.
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Themenbereich der Metrologie
Zeit und Frequenz
Innovationscluster
Quantentechnologie
Geschäftsfelder
Grundlagen der Metrologie
Zitierung
Spieß, L. J., Chen, S., Wilzewski, A., Wehrheim, M., Gilles, J., Surzhykov, A., Benkler, E., Filzinger, M., Steinel, M., Huntemann, N., Cheung, C., Porsev, S. G., Bondarev, A. I., Safronova, M. S., Crespo López-Urrutia, J. R., & Schmidt, P. O. (2025). Excited-state magnetic properties of carbon-like Ca¹⁴⁺. Physical Review Letters, 043002-1–043002-7. https://doi.org/10.1103/p88p-brnx
