what is now known as the Lamb shift.

In 1978, on Lamb's 65th birthday, Freeman Dyson addressed him as follows: "Those years, when the Lamb shift was the central theme of physics, were golden years for all the physicists of my generation. You were the first to see that this tiny shift, so elusive and hard to measure, would clarify our thinking about particles and fields."

Derivation

This heuristic derivation of the electrodynamic level shift follows Theodore A. Welton's

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