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arXiv · 2504.00974

Laser spectroscopy on the hyperfine structure and isotope shift of sympathetically cooled $^{229}$Th$^{3+}$ ions

G. Zitzer·J. Tiedau·Ch. E. Düllmann·M. V. Okhapkin·E. Peik
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Abstract

The hyperfine structure of $^{229}$Th$^{3+}$ ions in the nuclear ground state is investigated via laser spectroscopy of trapped Th$^{3+}$ ions that are sympathetically cooled by laser-cooled $^{88}$Sr$^+$ ions in a linear Paul trap. The isotope shift to $^{230}$Th$^{3+}$ and the hyperfine constants for the magnetic dipole (A) and electric quadrupole (B) interactions for the 5F$_{5/2}$ and 6D$_{5/2}$ electronic states of $^{229}$Th$^{3+}$ are determined. These measurements provide nuclear moments of $^{229}$Th with reduced uncertainty and serve as a preparation for improved hyperfine spectroscopy of the 8.4 eV nuclear isomeric state in $^{229}$Th$^{3+}$ ions.

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G. Zitzer, J. Tiedau, Ch. E. Düllmann, M. V. Okhapkin, E. Peik. 2025-04-01. Laser spectroscopy on the hyperfine structure and isotope shift of sympathetically cooled $^{229}$Th$^{3+}$ ions. https://arxiv.org/abs/2504.00974

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