Erlangen 2018 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 32: Precision Spectroscopy IV - highly charged ions (joint session A/Q)
Q 32.6: Vortrag
Dienstag, 6. März 2018, 15:30–15:45, K 1.016
Precision theory of the g factor of highly charged ions — •Zoltán Harman1, Bastian Sikora1, Halil Cakir1, Vladimir A. Yerokhin1,2, Natalia S. Oreshkina1, and Christoph H. Keitel1 — 1Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany — 2Center for Advanced Studies, Peter the Great St. Petersburg Polytechnic University, 195251 St. Petersburg, Russia
Quantum electrodynamic (QED) contributions to the electron g factor in strong binding fields have been tested to high precision in Penning trap measurements: an experiment with 28Si13+ allowed to benchmark certain higher-order QED corrections for the first time [1]. Recently, the uncertainty of the electron mass has been largely decreased via measurements on the 12C5+ ion [2], and by using the theoretical value of the g factor. In order to reduce theoretical uncertainties, we calculate further higher-order corrections.
An independent and improved determination of the fine-structure constant α may also be possible in near future employing a weighted difference of the g factors of the H- and Li-like ions of the same element. This weighted difference in chosen to maximize the cancellation of detrimental nuclear effects between the two charge states. It is shown that this method can be used to extract a value for α from bound-electron g-factor experiments with an accuracy competitive with or better than the present literature value [3]. – [1] S. Sturm et al., Phys. Rev. Lett. 107 023002 (2011); [2] S. Sturm et al., Nature 506 467 (2014); [3] V. A. Yerokhin et al., Phys. Rev. Lett. 116 100801 (2016).