Mainz 2026 – scientific programme
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A: Fachverband Atomphysik
A 14: Poster – Precision Spectroscopy of Atoms and Ions (joint session A/Q)
A 14.15: Poster
Tuesday, March 3, 2026, 17:00–19:00, Philo 1. OG
Precision spectroscopy of highly charged ions — •Amir Khan1, Malte Wehrheim1, Shuying Chen1, Lukas J. Spieß1, Alexander Wilzewski1, José R. C. López-Urrutia2, and Piet O. Schmidt1,3 — 1Physikalisch Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany — 2Max-Planck Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany — 3Institut für Quantenoptik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany
The large binding energy of the remaining electrons in highly charged ions (HCI) makes highly charged ions ideal candidates for applications in frequency metrology and the probing of fundamental physics [1]. So far, we have realized Ar13+ and Ca14+ optical clocks with an uncertainty of 10−16 limited by statistics [2, 3]. In this work we demonstrate how we can overcome this limitation by using a new spectroscopy species Ni12+. We report the identification of the clock [4] and logic transitions and the progress towards a clock with expected systematic and statistical uncertainties at the low 10−18 level. Finally, we introduce Os16+ as a promising contender for an optical clock. Os16+ features more than three clock transitions, with expected small systematic uncertainties and featuring narrow linewidths. References: [1] M. G. Kozlov, M.S. Safronova, et al., Rev. Mod. Phys. 90 (2018) [2] S. A. King, L. J. Spiess, et al., Nature 611, 43 (2022) [3] A. Wilzewski, et al., Phys. Rev. Lett. 134, 233002 (2025) [4] C. Cheung, et al., Phys. Rev. Lett. 135, 093002 (2025)
Keywords: HCI; Spectroscopy; Clock; Metrology