Lamb Shift in Hydrogenlike Argon

Abstract
The Lamb shift S in hydrogenlike argon (Z=18) has been measured by a motional-electric-field-quenching time-of-flight experiment. We find S=38.0±0.6 THz where the error includes 1-standard-deviation statistical error of 0.35 THz and an estimated systematic error of 0.48 THz.

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