Hamburg 2009 – scientific programme
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A: Fachverband Atomphysik
A 15: Poster I
A 15.4: Poster
Tuesday, March 3, 2009, 16:30–19:00, VMP 9 Poster
Towards Laser Spectroscopy of the Ground State Hyperfine Splitting in Lithium-like 209 Bi80+ — •Matthias Nothhelfer1,2, Benjamin Botermann1,2, Andreas Dax3, Christopher Geppert2, Volker Hannen4, Thomas Kühl2, Rodolfo Sánchez2, Thomas Stöhlker2, Christian Weinheimer4, and Wilfried Nörtershäuser1,2 — 1Universität Mainz, Germany — 2GSI Darmstadt, Germany — 3CERN, Genève, Switzerland — 4Universität Münster, Germany
Measurements of the hyperfine splitting (HFS) in H- and Li-like heavy ions can be used to test QED in extremly strong fields. Comparing the transition frequencies, one can eliminate the contribution of the nuclear magnetization distribution (Bohr-Weisskopf effect) and test QED calculations [1]. 209Bi is the only isotope, which has the ground state hyperfine transitions of both the H-like and the Li-like ion in a range accessible for laser spectroscopy in traps. So far, measurements have been performed with a relative uncertainty of 1.6 · 10−4 (209Bi82+) [2] and 6 · 10−3 (209Bi80+) [P. Beiersdorfer, priv. comm.], respectively. We are preparing a collinear laser spectroscopic measurement of the HFS in 209Bi80+ at the Experimental Storage Ring at GSI. This experiment tests QED calculations and facilitates measurements on trapped ions [3] with a potential uncertainty below 10−6, which will test QED calculations on the level of a few percent.
[1] V. M. Shabaev et al., PRL 86, 3959 (2001)
[2] I. Klaft et al., PRL 73, 2425 (1993)
[3] W. Quint et al., PRA 78, 032517 (2008)