High-Precision Test of QED in the 2p fine structure dublett of Be+ ions appeared in Physical Review Letters

We have determined the fine structure splitting of the 2p states in Be+ ions for stable and short-lived isotopes at COLLAPS. This leads to an improvement of the accuracy of the Be-9 fine structure splitting by two orders of magnitude and results are compared with new ab initio atomic structure calculations with a similar level of accuracy. This provides now one of the most precise tests of bound-state QED in three-electron systems.

Please read more in the PRL article (arXiv:1507.03830).

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