Abstract
We discuss the status of measurements of the 2s Lamb shift in singly-ionized helium (He +) and of the 1s Lamb shift in one-electron calcium or titanium ions. The He + Lamb shift experiment, which is being done at Princeton University, utilizes the microwave-resonance method in a beam of metastable He +. The high- Z experiment involves measurement of the 1s-2p transition energies using precision X-ray spectroscopy. This experiment will be carried out at the Argonne tandem-Linac (ATLAS).
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