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We present ab initio calculations of the complete gauge invariant set of the self energy and vacuum polarization screening diagrams for the 2p $$2{\text{p}}_{{\text{1/2}}} - 2{\text{s}} $$ transition in Li like ions. Various contributions to the transition energy are collected. The accuracy of theoretical predictions is discussed.
Initial tests from the Freiburg electron beam ion trap are reported. Highly charged ions of xenon, barium, tungsten and krypton have been observed with charge states up to 60+ by means of X-ray spectroscopy. The current status, upgrade and future experiments are outlined.
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