Lamb shift calculated by simple noncovariant method
Abstract
The Lamb Shift (LS) of Hydrogenlike atom is evaluated by a simple method of quantum electrodynamics in noncovariant form, based on the relativistic stationary Schr\"odinger equation. An induced term proportional to p4 in the effective Hamiltonian is emphasized. Perturbative calculation of second order leads to the LS of 1S1/2 state and that of 2S1/2-2P1/2 states in H atom with the high accuracy within 0.1%
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