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  • Letter
  • Open Access

Laser spectroscopy on the hyperfine structure and isotope shift of sympathetically cooled Th3+229 ions

G. Zitzer1, J. Tiedau1, Ch. E. Düllmann2,3,4, M. V. Okhapkin1, and E. Peik1,*

  • *Contact author: ekkehard.peik@ptb.de
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Phys. Rev. A 111, L050802 – Published 23 May, 2025

DOI: https://doi.org/10.1103/PhysRevA.111.L050802

Abstract

The hyperfine structure of Th3+229 ions in the nuclear ground state is investigated via laser spectroscopy of trapped Th3+ ions that are sympathetically cooled by laser-cooled Sr+88 ions in a linear Paul trap. The isotope shift to Th3+230 and the hyperfine constants for the magnetic dipole (A) and electric quadrupole (B) interactions for the 5F5/2 and 6D5/2 electronic states of Th3+229 are determined. These measurements provide nuclear moments of Th229 with reduced uncertainty and serve as a preparation for improved hyperfine spectroscopy of the 8.4 eV nuclear isomeric state in Th3+229 ions.

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Phys. Rev. A 111, L050802– Published 23 May, 2025
  • Received 27 March 2025
  • Accepted 2 May 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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