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Q: Fachverband Quantenoptik und Photonik
Q 40: Precision Spectroscopy of Atoms and Ions III (joint session A/Q)
Q 40.1: Talk
Thursday, March 14, 2024, 11:00–11:15, HS 1010
Resolved sideband spectroscopy of cold mixed ioncystals of Ca+ and Th+ — •Azer Trimeche1, Can Leichtweiß1, Jonas Stricker2,3, Valerii Andriushkov1,2, Dmitry Budker1, Christoph E. Düllmann2,3,4, and Ferdinand Schmidt-Kaler1 — 1QUANTUM, Institut für Physik, Johannes Gutenberg-Universität Mainz, Germany — 2Helmholtz-Institut Mainz, Germany — 3Department Chemie - Standort TRIGA, Johannes Gutenberg-Universität Mainz, Germany — 4GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany
Thorium isotopes became of high interest in the search for new physics, and fundamental physics tests, because of their unique nuclear and atomic properties. The Trapping And Cooling of Thorium Ions in Calcium crystals (TACTICa) project develops ion trapping and spectroscopic techniques for a precise determination of the nuclear moments, hyperfine intervals, and isotope shifts with different Th isotopes. For the production, we use two different sources: a recoil ion source [1] and a laser ablation source [2]. 232Th+ ions are trapped in a 40Ca+ crystal [2], and cooled down sympathetically by polarization gradient cooling [3]. We implement resolved sideband spectroscopy of mixed Ca-Th ion crystals as a starting point for resolved sideband ground state cooling of crystals with extreme charge-to-mass ratio difference and quantum logic spectroscopy of Th ions.
[1] R. Haas et al., Hyperfine interactions 241 (2020) 25.
[2] K. Groot-Berning et al., PRA 99 (2019) 023420.
[3] W. Li et al., NJP 24(4) (2022) 043028.
Keywords: trapped ions; laser spectroscopy; Thorium ions spectroscopy