title: Electron-electron interaction in strong electromagnetic fields: the two-electron contribution to the ground-state energy in He-like uranium.
abstract: Radiative recombination transitions into the ground state of cooled bare and hydrogenlike uranium ions were measured at the storage ring ESR. By comparing the corresponding x-ray centroid energies, this technique allows for a direct measurement of the electron-electron contribution to the ionization potential in the heaviest He-like ions. For the two-electron contribution to the ionization potential of He-like uranium we obtain a value of 2248+/-9 eV. This represents the most accurate determination of two-electron effects in the domain of high-Z He-like ions, and the accuracy reaches already the size of the specific two-electron radiative QED corrections.
authors.affiliation: Gesellschaft für Schwerionenforschung, 64291 Darmstadt, Germany and Institut für Kernphysik, University of Frankfurt, 60486 Frankfurt, Germany.
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authors.lastname: Gumberidze
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authors.lastname: Stöhlker
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authors.lastname: Mokler
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authors.lastname: Steck
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authors.lastname: Sierpowski
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authors.lastname: Tashenov
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authors.lastname: Warczak
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authors.lastname: Zou