Bonn 2025 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 17: Precision Spectroscopy of Atoms and Ions II (joint session A/Q)

Q 17.6: Vortrag

Montag, 10. März 2025, 18:30–18:45, HS PC

Laser spectroscopy of the hyperfine structure of sympathetically cooled ²²⁹Th³⁺ ions — •Gregor Zitzer, Johannes Tiedau, Maksim Okhapkin, and Ekkehard Peik — Physikalisch-Technische Bundesanstalt, Braunschweig

The isotope ²²⁹Th has a low-lying isomeric state at only about 8.4 eV which enables resonant laser excitation. Future versions of optical clocks are planned to use this special property. For an improved understanding of the nuclear structural changes underlying the low-energy transition, knowledge of the nuclear moments of the ground and isomeric state is required. The hyperfine structure of ²²⁹Th³⁺ ions in the nuclear ground state are investigated via laser spectroscopy on ⁸⁸Sr⁺ sympathetically cooled ions confined in a linear Paul trap. The relative isotope shift to ²³⁰Th³⁺ and the hyperfine constants for the magnetic dipole (A) and electric quadrupole (B) for the 5F_5/2 and 6D_5/2 electronic states are determined. The new values reduce the uncertainties of previous measurements.

Keywords: Th-229; Nuclear clock; Hyperfine spectroscopy