2ND-ORDER SELF-ENERGY-VACUUM-POLARIZATION CONTRIBUTIONS TO THE LAMB SHIFT IN HIGHLY-CHARGED FEW-ELECTRON IONS

Proceeding towards the evaluation of the complete set of radiative cor rections of order alpha(2) to the energy levels of hydrogenlike system s, the second-order self-energy-vacuum-polarization contribution to th e Lamb shift of bound electrons is derived and calculated. We focus on the Uehling part of the vacuum-polarization insertion in the effectiv e photon interaction. Additional energy corrections of order alpha(2) are also calculated. We present a brief summary of various energy cont ributions for K- and L-shell electrons in hydrogenlike and lithiumlike high-Z ions.