Erlangen 2022 – scientific programme

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A: Fachverband Atomphysik

A 24: Precision spectroscopy of atoms and ions III (joint session A/Q)

A 24.1: Invited Talk

Thursday, March 17, 2022, 10:30–11:00, A-H3

Spectroscopy of a Highly Charged Ion Clock with Sub-Hz Uncertainty — •Lukas J. Spieß¹, Steven A. King¹, Peter Micke^1,2, Alexander Wilzewski¹, Tobias Leopold¹, Erik Benkler¹, Nils Huntemann¹, Richard Lange¹, Andrey Surzhykov¹, Robert Müller¹, Lisa Schmöger², Maria Schwarz², José R. Crespo López-Urrutia², and Piet O. Schmidt^1,3 — ¹Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — ²Max-Planck-Institut für Kernphysik, Heidelberg, Germany — ³Institut für Quantenoptik, Leibniz Universität Hannover, Germany

Modern optical clocks are the most accurate metrological devices ever built. So far, such systems were only based on neutral and singly charged atoms. Potential further candidates are highly charged ions (HCI) which are intrinsically less sensitive to several types of external perturbations [1]. In previous work, we have demonstrated quantum logic spectroscopy of a HCI [2], enabling the first ever clock-like spectroscopy of these species.

We will present the first sub-Hz accuracy measurement of an optical transition in a HCI. The transition frequency of the 441 nm line in Ar¹³⁺ is compared to the electric octupole transition frequency in ¹⁷¹Yb⁺. Measurements were performed for the two isotopes ⁴⁰Ar and ³⁶Ar which yields the isotope shift at sub-Hz accuracy and provides input for theoretical studies.

[1] M. G. Kozlov et al., Rev. Mod. Phys. 90 (2018)

[2] P. Micke et al., Nature 578 (2020)