Its discovery led to the 1955 Nobel Prize for its American namesake, for 10 points, name this slight energy difference between the 2p one-half and 2s one-half state in hydrogen.
As a possible result of Dirac theory, Zitterbewegung could be used to explain this phenomenon. Experimental measurement of this phenomenon has revealed that the value of the electron spin g-factor is slightly larger than two.  Providing an accurate measure for the fine-structure constant, its existence is supported by Quantum Electrodynamics, which requires an absence of vacuum polarization near the nucleus of the atom. Its presence was fully explained in the hydrogen spectrum in 1947 by Hans Bethe. Its discovery led to the 1955 Nobel Prize for its American namesake, for 10 points, name this slight energy difference between the 2p one-half and 2s one-half state in hydrogen.
As a possible result of Dirac theory, Zitterbewegung could be used to explain this phenomenon.
Lamb Shift