Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 53: Precision Spectroscopy of Atoms and Ions IV (joint session A/Q)
Q 53.5: Vortrag
Donnerstag, 5. März 2026, 12:15–12:30, N 3
DRALS: A new tool to investigate the hyperfine structure in highly charged ions — •Dimitrios Zisis for the LIBELLE collaboration — Institut für Kernphysik, Technische Universität Darmstadt, Germany — Helmholtz Forschungsakademie Hessen für FAIR, Campus Darmstadt, Germany
We report on the first laser excitation of the ground-state hyperfine transition in lithium-like 208Bi80+. The experiment was performed at the ESR, in May 2025. Detection of the transition was enabled through a new measurement scheme that combines laser excitation with dielectronic recombination (DR). In this approach, the electron cooler is set to a voltage that leads to the DR process predominantly from the upper hyperfine state. Resonant laser driving of the transition to the upper state thus leads to an enhancement of the DR recombination rate detected with particle detectors behind the electron cooler.
This technique has been successfully demonstrated for the first time using the radioactive isotope 208Bi in the lithium-like charge state, a species that is inherently difficult to produce, decelerate, and store at the required energies in the ESR. These results establish the feasibility of the method and pave the way for precision measurements during the next beam time, which has already been approved by the GPAC (Proposal G-24-00290). This research was funded by BMFTR, Contract numbers 05P24RD5, 05P21RGFA1 and 5P24RG2.
Keywords: laser spectroscopy; dielectronic recombination; ESR; bismuth; hyperfine splitting