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A: Fachverband Atomphysik
A 7: Precision spectroscopy of atoms and ions I
A 7.5: Vortrag
Montag, 9. März 2020, 15:15–15:30, f107
hyperfine splitting in Li- and B-like multi-charged ions — •Valeriia Kosheleva1,2,3, Andrey Volotka1,2, Dmitry Glazov3, and Stephan Fritzsche1,2 — 1Helmholtz Institute Jena, 07743 Jena, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany — 3Department of Physics, St. Petersburg State University, 199034 St. Petersburg, Russia
We report a complete evaluation of the two-photon exchange corrections to the hyperfine structure (hfs) in Li-like ions for a wide range of nuclear charge Z within the framework of rigorous QED approach [1]. In comparison to the previous theoretical calculations, we substantially improved the accuracy of the interelectronic-interaction corrections to the ground-state hfs in Li-like ions by applying the extended Furry picture framework.Furthermore, we perform comprehensive relativistic calculations of the interelectronic- interaction and QED contributions to the ground-state hfs for selected B-like ions in the range Z = 49-83 [2]. As the result, we tabulated the most accurate theoretical hfs values in B-like ions. It is worth noting that the uncertainty of final values almost equally originates from the Bohr-Weisskopf correction and from the higher-order interelectronic-interaction contribution. The Bohr-Weisskopf uncertainty, however, can be canceled in specific differences of the hfs values. While the second uncertainty strongly motivates the rigorous evaluation of the two-photon exchange diagrams, which has been performed so far only for lithiumlike ions.
[1] V. P. Koshelva, A. V. Volotka, D. A. Glazov, S. Fritzsche, to be published. [2] D. A. Glazov, et al., Phys. Rev. A 99, 062503 (2019).