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

2025/04/01 by G. Zitzer, Zitzer, G., Johannes Tiedau +7 · 1 citation
Physics and Astronomy · #Advanced Frequency and Time Standards #Atomic Physics (physics.atom-ph) #Atomic and Molecular Physics #FOS: Physical sciences #Nuclear physics research studies

paper · pdf · doi:10.48550/arxiv.2504.00974

openalex publication_date 2025/04/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The hyperfine structure of ²²⁹Th³⁺ ions in the nuclear ground state is investigated via laser spectroscopy of trapped Th³⁺ ions that are sympathetically cooled by laser-cooled ⁸⁸Sr⁺ ions in a linear Paul trap. The isotope shift to ²³⁰Th³⁺ 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 ²²⁹Th³⁺ are determined. These measurements provide nuclear moments of ²²⁹Th with reduced uncertainty and serve as a preparation for improved hyperfine spectroscopy of the 8.4 eV nuclear isomeric state in ²²⁹Th³⁺ ions.

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