Electron-electron interaction in strong electromagnetic fields: The two-electron contribution to the ground-state energy in He-like uranium

Radiative recombination transitions into the ground state of cooled bare and hydrogen-like 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. (orig.)Available from TIB Hannover: RA 3692(04-11) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman