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Expressions for the effective Quantum Electrodynamics (QED) Hamiltonian dueto self-energy screening (self-energy correction to the electron-electroninteraction) are presented. We use the method of the two-time Green's function,which handles quasidegenerate atomic states. From these expression one canevaluate energy corrections to, e.g., 1s2p 3P1 and 1s2p 1P1 levels in heliumand two-electron ions, to all orders in Z\alphaComment: 5 pages Typesetting modifie

Contribution of the screened self-energy to the Lamb shift of quasidegenerate states