S-matrix calculations of energy levels of the lithium isoelectronic sequence
POSTER
Abstract
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.
*The work of J.S.\ was supported in part by NSF Grant No.\ NSF-1068065. The work of K.T.C.\ was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.