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A: Fachverband Atomphysik

A 13: Highly Charged Ions and their Applications II

A 13.1: Invited Talk

Tuesday, March 3, 2026, 11:00–11:30, N 25

Identifications of clock transitions in heavy highly charged ions with high sensitivity to physics beyond the Standard Model — Nils-Holger Rehbehn¹, Lakshmi P. Kozhiparambil Sajith^1,2, Michael K. Rosner¹, Charles Cheung³, Sergey G. Porsev³, Marianna S. Safronova³, Samuel M. Brewer⁸, Steven Worm², Dmitry Budker^4,5,6,7, Thomas Pfeifer¹, José R. Crespo López-Urrutia¹, and •Hendrik Bekker^4,5,6 — ¹Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany — ²DESY, D15738 Zeuthen, Germany — ³Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA — ⁴Johannes Gutenberg-Universität Mainz, 55122 Mainz, Germany — ⁵Helmholtz Institute Mainz, 55099 Mainz, Germany — ⁶GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany — ⁷Department of Physics, University of California, Berkeley, CA 94720-7300, USA — ⁸Department of Physics, Colorado State University, Fort Collins, Colorado 80523, USA

Atomic theory predicts numerous optical transitions in a plethora of highly charged ions with exquisite sensitivity to new physics. However, large ucertainties arrise due to the complexity of the atomic structures, precluding direct application of state-of-the-art frequency metrology techniques. We present measurements of Os^15,16,17+ and Pr¹⁰⁺ at an electron beam ion trap leading to atomic-theory-supported identifications of transitions suitable for new-physics searches. The discovered electric quadrupole (E2) transitions of Os¹⁶⁺ are especially suitable for frequency metrology due to their small linewidth down to 44 µHz.

Keywords: Spectroscopy; Optical; Atomic theory; Frequency metrology