Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 60: Precision Spectroscopy of Atoms and Ions VI (joint session A/Q)
Q 60.4: Vortrag
Donnerstag, 13. März 2025, 15:30–15:45, KlHS Mathe
Accurate isotope shift measurements in the 5s→5p and 4d→5p lines of Sr+ — •Julian Palmes, Kristian König, Hendrik Bodnar, Patrick Müller, Imke Lopp, Julien Spahn, and Wilfried Nörtershäuser — Institut für Kernphysik, TU Darmstadt, Germany
Accurate measurements of different transition frequencies in multiple isotopes allow for the determination of the isotope shift and thus the calculation of the field-shift ratio Fi /Fj , which is an important parameter to compare experimental results with state-of-the-art atomic structure calculations. In 2016, Shi et al. [1] measured the FD2/FD1 field shift ratio in Ca+ to be above theoretical boundaries set by the hydrogenic model, which set off a series of measurements in Ca+ [2], Ba+ [3] and now Sr+ at the Collinear Apparatus for Laser Spectroscopy and Applied Science (COALA) at the Technical University of Darmstadt. We report absolute frequency measurements of the stable Sr+ isotopes of the 5s→ 5p and the 4d→ 5p transitions. A King plot analysis was performed to extract the field shift ratio FD2/FD1, and utilizing the 4d→ 5p transitions, ring closures were formed for self-consistency. Additionally, this method allowed for a precise observation of the hyperfine splitting of the 87Sr+ isotope, which is the first step for the investigation of the magnetic octupole moments at the BICEPS trap. Funding by BMBF under contract 05P21RDFN1 is acknowledged.
[1] Shi et al., Applied Physics B 123, 2 (2016)
[2] Müller et al., Physical Review Research 2.4 (2020)
[3] Imgram et al., Physical Review A 99.1 (2019)
Keywords: Collinear laser spectroscopy; Isotope shift; Field shift; King Fit