SAMOP 2023 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 30: Highly Charged Ions and their Applications II

A 30.5: Vortrag

Freitag, 10. März 2023, 15:45–16:00, F107

An optical clock based on highly charged ions and its application for new physics searches — •Alexander Wilzewski¹, Lukas J. Spiess¹, Steven A. King¹, Malte Wehrheim¹, Shuying Chen¹, Michael K. Rosner², Andrey Surzhykov^1,4, Erik Benkler¹, Nils Huntemann¹, José R. Crespo Lopez-Urrutia², and Piet O. Schmidt^1,3 — ¹Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany — ²Max-Planck-Instituts für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany — ³Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany — ⁴Technische Universität Braunschweig, Universitätsplatz 2, 38106 Braunschweig, Germany

In our experiment, we extract highly charged ions (HCIs) from an electron-beam ion trap (EBIT) and transfer them to a linear Paul trap where they are recaptured and sympathetically cooled by laser-cooled Be⁺ ions. Recently, we fully evaluated the systematic uncertainty of an optical clock based on Ar¹³⁺. By comparison with the octupole transition in Yb⁺ we determined the isotope shift of the optical transitions between ³⁶Ar¹³⁺ and ⁴⁰Ar¹³⁺ with sub-Hz accuracy [1]. Ca¹⁴⁺ offers five stable isotopes and a suitable optical transition [2] for a King plot analysis to search for a hypothetical fifth force when combined with isotope shifts of the clock transition in Ca⁺. We present results on a laser ablation source for our EBIT, the Ca¹⁴⁺ clock laser system, and first isotope shift measurements. [1] S. A. King, L. J. Spiess et al., Nature 611 (2022), [2] N. Rehbehn et al., Phys. Rev. A 103 (2021)et al., Phys. Rev. Research 2, (2020)