Physics – Quantum Physics
Scientific paper
1997-07-03
Physics
Quantum Physics
23 pages, LaTeX (RevTeX), 5 eps-figures
Scientific paper
We present a calculation scheme for the two-loop vacuum polarization correction of order $\alpha^2$ to the Lamb shift of hydrogen-like high-Z atoms. The interaction with the external Coulomb field is taken into account to all orders in $(Z\alpha)$. By means of a modified potential approach the problem is reduced to the evaluation of effective one-loop vacuum polarization potentials. An expression for the energy shift is deduced within the framework of partial wave decomposition performing appropriate subtractions. Exact results for the two-loop vacuum polarization contribution to the Lamb shift of K- and L-shell electron states in hydrogen-like Lead and Uranium are presented.
Beier Thomas
Persson H.
Plunien Guenter
Soff Gerhard
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