Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 30: Precision spectroscopy of atoms and ions II
A 30.2: Hauptvortrag
Donnerstag, 15. März 2012, 11:00–11:30, V47.03
Test of fundamental physics with highly charged ions — •Z. Harman1, C. Beilmann1, J. R. Crespo López-Urrutia1, S. Sturm1,2, V. Yerokhin1,3, J. Zatorski1, K. Blaum1, J. Ullrich1, and C. H. Keitel1 — 1Max Planck Institute for Nuclear Physics, Heidelberg, Germany — 2University of Mainz, Germany — 3St. Petersburg State Polytechnical University, Russia
In highly charged ions (HCI), the strong nuclear Coulomb force renders the electron dynamics relativistic, and effects of strong-field quantum electrodynamics (QED) are increasingly relevant at higher and higher charges. A recent study has shown that surprising electron correlation effects appear already at low charge states, e.g. in C-like Ar: it was found that a recombination process with the participation of three electrons may result in a cross section higher than that of the usual dielectronic recombination [1]. Furthermore, we propose an alternative way of determining spectral properties of HCI by employing an x-ray free electron laser and an optical laser. Bound-state QED effects can be scrutinized to high precision in Penning trap experiments: a recent measurement yielded a value for the g factor of H-like Si with a 5·10−10 fractional uncertainty, allowing to test certain higher-order QED corrections for the first time [2]. As theoretically suggested, similar experiments may even deliver more accurate or so far unknown nuclear shape parameters [3] and magnetic moments, relevant to NMR spectroscopy [4]. – [1] C. Beilmann et al., PRL 107, 143201 (2011); [2] S. Sturm et al., PRL 107, 023002 (2011); [3] J. Zatorski et al., arxiv:1110:3330; [4] V. I. Yerokhin et al., PRL 107, 043004 (2011).