S-matrix calculations of energy levels of the lithium isoelectronic sequence

A QED approach to the calculation of the spectra of the lithium isoelectronic sequence is implemented. A modified Furry representation based on the Kohn-Sham potential is used to evaluate all one- and two-photon diagrams with the exception of the two-loop Lamb shift. Three-photon diagrams are estimated with Hamiltonian methods. After incorporating recent calculations of the two-loop Lamb shift and recoil corrections, a comprehensive tabulation of the 2s, 2p(1/2), and 2p(3/2) energy levels as well as the 2s-2p(1/2) and 2s-2p(3/2) transition energies for Z = 10-100 is presented.