Abstract
We report on a novel technique which exploitsradiative recombination transitions for a direct experimental determination of the two-electron contributions to the ground state energy in heliumlike high-Z ions. Results are presented of a first experiment which was conducted at an electron beam ion trap for various elements ranging from Z=32 to 83. The comparison with theoretical predictions demonstrates that the achieved precision already provides a sensitive test of second order many-body contributions and approaches the size of the two-electron (screened) Lamb shift. The potential of the new technique will be outlined and the capability of the ESR storage ring for future investigations will be emphasized.
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