Testing Strong-Field QED to Second Order in the Highly Correlated Atomic System Berylliumlike Pb^{78+} by
S Schippers1,2, C Brandau1,3, S Fuchs1,2
1Justus-Liebig-Universität Gießen, I. Physikalisches Institut, 35392 Giessen, Germany.
Abstract:
A low-energy storage ring with an ultracold electron cooler has been coupled with a heavy-ion accelerator facilitating high-resolution electron-ion collision spectroscopy of the heaviest few-electron ions. In the present Letter resonant electron-ion recombination of berylliumlike Pb^{78+} ions was measured in the collision-energy range 9.3-16.5 eV and a value of 244.937(30) eV is derived for the Pb^{78+}(2s^{2} ^{1}S_{0}-2s2p ^{3}P_{1}) excitation energy. This result agrees with the most recent (less accurate) theoretical value of 244.942(52) eV [Malyshev et al., Phys. Rev. A 110, 062824 (2024)PLRAAN2469-992610.1103/PhysRevA.110.062824], which has been calculated by applying strong-field QED rigorously up to the second order. The present investigation suggests that further technical improvements can potentially increase the experimental accuracy by an order of magnitude.
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