title: High precision atomic theory for Li and Be+: QED shifts and isotope shifts.
abstract: High-precision results are presented for calculations of the nonrelativistic energies, relativistic corrections, and quantum electrodynamic corrections for the 2 2S, 2 2P, and 3 2S states of Li and Be+, using nonrelativistic wave functions expressed in Hylleraas coordinates. Bethe logarithms are obtained for the states of Be+. Finite mass corrections are calculated with sufficient accuracy to extract the nuclear charge radius from measurements of the isotope shift for the 2 2S-2 2P and 2 2S-3 2S transitions. The calculated ionization potential for Be+ is 146 882.923+/-0.005 cm{-1}.
authors.affiliation: Department of Physics, University of New Brunswick, Fredericton, New Brunswick, Canada E3B 5A3. zyan@unb.ca
authors.forename: Z-C
authors.initials: ZC
authors.lastname: Yan
authors.forename: W
authors.initials: W
authors.lastname: Nörtershäuser
authors.forename: G W F
authors.initials: GW
authors.lastname: Drake