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A: Fachverband Atomphysik

A 26: Poster Session II

A 26.23: Poster

Mittwoch, 8. März 2017, 17:00–19:00, P OG1

Isotopic shift of ³⁶Ar/⁴⁰Ar measured with a spin-orbit wave packet — •Sofia Botsi, Nicolas Camus, Lutz Fechner, Thomas Pfeifer, and Robert Moshammer — 1 Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany

High precision measurements of isotopic shifts in noble gases can provide a very good test of relativistic and quantum electrodynamic effects. In our experiment, we measured the isotopic shift between ³⁶Ar and ⁴⁰Ar for the 3s² 3p⁵ (²P_3/2 → ²P_1/2) transition for singly ionized argon atoms. We measured the shift by implementing a Ramsey scheme using two ultra-short (∼ 6fs) laser pulses. The first laser pulse excites the system in a coherent superposition of the aforementioned states. This superposition leads to a spin-orbit wave packet whose dynamics can be investigated by applying a second delayed probe pulse. A Mach-Zehnder interferometer was built, introducing a 3.97ns time delay between the two pulses.To detect the different argon isotopes we used a reaction microscope spectrometer (REMI). The isotopic shift is found to be (1.22 ± 0.12)·10⁻⁷eV and it is the first time it has been measured for this transition to the best of our knowledge.