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A: Fachverband Atomphysik
A 15: Precision spectroscopy of atoms and ions II
A 15.4: Vortrag
Mittwoch, 11. März 2020, 12:00–12:15, f107
Collinear Laser Spectroscopy of Ca+: Solving the field shift puzzle of the 4s→ 4p transitions — •Patrick Müller1, Phillip Imgram1, Kristian König2, Jörg Krämer1, Bernhard Maaß1, and Wilfried Nörtershäuser1 — 1Institut für Kernphysik, Technische Universität Darmstadt — 2NSCL, Michigan State University
The ratio of the isotopic field shifts can be accessed well from theory as well as from experiment and hence, serves as a profound benchmark for atomic structure calculations. Experimentally, it can be determined solely from optical frequency measurements of two different transitions over the isotopic chain. Previous ion trap measurements of the 4s 2S1/2→ 4p 2P1/2 (D1) and 4s 2S1/2→ 4p 2P3/2 (D2) transition resulted in a field shift ratio of FD2/FD1 = 1.0085(12) which exceeds all theoretical predictions and even the boundaries set by the hydrogenic model [1].
We report on collinear laser spectroscopy measurements of the 4s→ 4p as well as the 3d→ 4p transition frequencies in naturally abundant Ca+ isotopes at the 100-kHz precision level. The 4s→ 4p transitions were used to determine the field shift ratio FD2/FD1 in a King plot analysis. The new experimental value agrees well with preceding atomic structure calculations and was successfully checked for self-consistency by combining the results of the 4s→ 4p and 3d→ 4p transitions to form ring closures across the contributing states.
Acknowledgement This work has been supported by BMBF under contract # 05P19RDFN1.
[1] Shi et al., Applied Physics B 123, 2 (2016)