The principles of observation of a steady-state interference pattern for the 2S and 2P levels of hydrogen-like He~+ in a uniform electric field are formulated. A new method for measuring the Lamb shift #delta#_(n = 2) = 2S - 2P based on the utilization of the method of atomic interferometer is proposed. Quantum-electrodynamic consequences that follow from comparing the results of interferometric measurements and quantum-electrodynamic calculations of the Lamb shift in He~+ are discussed.
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