Rostock 2019 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 35: Precision Spectroscopy of atoms and ions
A 35.15: Poster
Donnerstag, 14. März 2019, 16:15–18:15, S Fobau Physik
Negative Ions Studies in the Frankfurt Low Energy Storage Ring (FLSR) — •Oliver Forstner1,2,3, Jan Müller4, Markus Schöffler4, Lothar Schmidt4, Thomas Stöhlker1,2,3, and Kurt Stiebing4 — 1Friedrich-Schiller-Universität Jena, Jena — 2Helmholtz-Institut Jena, Jena — 3GSI Helmholtzzentrum, Darmstadt — 4Goethe Universität, Frankfurt
In order to allow for studies of the electronic structure of negative atomic and molecular ions by laser photodetachment, a commercial rf charge exchange ion source for negative ions (Alphatross, National Electrostatic Corporation [1]) has been installed at the injection terminal of the Frankfurt Low Energy Storage Ring (FLSR) facility [2]. First tests with negative ions stored in FLSR at 20 keV have successfully been conducted. So far, the storage times of 50 nA He−, 260 nA O− and 110 nA OH− have been measured. They are in good agreement with the theoretical predicted storage times based on the residual gas pressure (pFLSR 1,0 - 2,0x10−10 mbar, corrected for H2 as residual gas). Also, the measured lifetime of the metastable He− of about 300 µs is in good agreement with previous measurements [3].
In a next step photodetachment of the stored ions with tunable laser beams in the VIS and NIR range will be performed.
[1] http://www.pelletron.com/products/rf-charge-exchange/ [2] K.E. Stiebing, V. Alexandrov, R. Dörner et al., Nucl. Instr. and Meth. A614, 10 (2010). [3] U.V. Pedersen, M. Hyde, S.P. Møller, T. Andersen, Phys. Rev. A64, 012503 (2001)