Hannover 2020 – scientific programme
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A: Fachverband Atomphysik
A 15: Precision spectroscopy of atoms and ions II
A 15.8: Talk
Wednesday, March 11, 2020, 13:00–13:15, f107
Laser photodetachment spectroscopy in a MR-ToF device — •D. Leimbach1,2,3, V. Lagaki1,4, for the GANDALPH1,2, and MIRACLS collaboration1,4 — 1CERN, Geneva, Switzerland — 2Dep. of Physics, University of Gothenburg, Sweden — 3Inst. für Physik, Johannes Gutenberg-Universität, Germany — 4Universität Greifswald, Germany
The electron affinity (EA) is the energy released when an additional electron is bound to a neutral atom, creating a negative ion. Due to the lack of a long-range Coulomb attraction, the EA is dominated by electron-correlation effects. Hence, EAs are strong experimental benchmarks on theoretical atomic-structure models which go beyond the independent particle approximation. Although the isotope shift (IS) in the EA of stable chlorine (Cl) isotopes has been measured, recent calculations improve the theoretical precision beyond the experimental one. For this reason, we plan to perform laser photodetachment spectroscopy to determine this IS more precisely. This will be achieved by reusing the ion beam when trapped in an MR-ToF device. Thereby, the measurement efficiency is increased which allows us to employ a narrow band cw laser compared to the previously used high-power and broad-band pulsed laser. Once successful, we will extend this type of studies for the first time to long-lived radionuclides by determining the IS of 36Cl(vs 35Cl). This novel approach can be applied to EA-IS measurements of short-lived radionuclides as well as EA determination of sparsely produced and eventually superheavy elements. We will present the technique and status of the experimental campaign.