Bonn 2025 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

Q: Fachverband Quantenoptik und Photonik

Q 64: Poster – Precision Spectroscopy of Atoms and Ions (joint session A/Q)

Q 64.8: Poster

Donnerstag, 13. März 2025, 17:00–19:00, Tent

Excited-state magnetic properties of carbon-like calcium — •Shuying Chen¹, Lukas J. Spieß¹, Alexander Wilzewski¹, Malte Wehrheim¹, Jan Gilles^1,2, Andrey Surzhykov^1,2, Erik Benkler¹, Melina Filzinger¹, Martin Steinel¹, Nils Huntemann¹, Charles Cheung³, Sergey G. Porsev³, Andrey I. Bondarev^4,5, Marianna S. Safronova³, José R. Crespo López-Urrutia⁶, and Piet O. Schmidt^1,7 — ¹Physikalisch-Technische Bundesanstalt, Germany — ²Technische Universität Braunschweig, Germany — ³University of Delaware, USA — ⁴Helmholtz-Institut Jena, Germany — ⁵GSI Helmholtzzentrum für Schwerionenforschung GmbH, Germany — ⁶Max-Planck-Institut für Kernphysik, Heidelberg, Germany — ⁷Leibniz Universität Hannover, Germany

Highly charged ions (HCI) are good probes for fundamental physics and the construction of high-precision optical clocks. The low number of electrons allows for possible precise theoretical calculations, which can be compared to accurate measurements. Magnetic properties, including the linear Zeeman shift, characterized by the g-factor, and the second order Zeeman shift, characterized by the C2 coefficient, are such feature. In this contribution, we demonstrate an excited-state g-factor measurement of Ca¹⁴⁺ via the estimation of the magnetic field using a co-trapped Be⁺ ion and compare the result to theoretical calculations, finding excellent agreement. Furthermore, we measured the C2 coefficient and verified the predicted small second-order Zeeman shift in HCI. The technique presented here can be extended to other HCIs.

Keywords: highly charged ions; optical clock; magnetic properties; quantum logic spectroscopy; g factor