Erlangen 2022 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 44: Precision spectroscopy of atoms and ions (joint session A/Q)
Q 44.16: Poster
Mittwoch, 16. März 2022, 16:30–18:30, P
Laser photodetachment threshold spectroscopy at FLSR: the experiment preparation — •Vadim Gadelshin1, Oliver Forstner2,3,4, Lothar Schmidt5, Kurt Stiebing5, Dominik Studer1, and Klaus Wendt1 — 1Institut für Physik, Johannes Gutenberg-Universität Mainz — 2Friedrich Schiller-Universität Jena — 3Helmholtz-Institut Jena — 4GSI Helmholtzzentrum Darmstadt — 5Institut für Kernphysik, Goethe-Universität Frankfurt
The Frankfurt Low-energy Storage Ring (FLSR) is a room-temperature electrostatic storage ring, which can reduce the internal energy of stored ions almost to the ambient temperature, being suitable for laser photodetachment threshold (LPT) spectroscopy to determine the electron affinity of negatively charged ions. The latter play a key role in accelerator mass spectrometry (AMS): lasers can selectively neutralize undesired isobars, providing a purified beam of an isotope of interest. To extend the range of available for AMS nuclides, it is necessary to identify neutralization schemes for unwanted ions.
With this intention, a compact laser lab was constructed with an optical path, guiding laser beams into FLSR. The laser setup is based on a tunable Ti:Sapphire laser and a pulsed Nd:YAG laser, serving as a pump laser for Ti:Sapphire crystal and as a high-energy laser beam at 532 nm. The RF plasma ion source with a Rb charge exchange cell was installed to produce beams of negatively charged ions.
The results of the experiment preparation and of first tests will be presented. The proof-of-principle of the setup is carried out for O- and OH- ions. An overview of planned LPT studies will be given.