Exact two-loop vacuum polarization correction to the Lamb shift in hydrogen-like ions
نویسندگان
چکیده
We present a calculation scheme for the two-loop vacuum polarization correction of order α2 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 (Zα). 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 Kand L-shell electron states in hydrogen-like Lead and Uranium are presented. PACS-numbers: 31.10.+z, 31.30.-i, 31.30.Jv
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تاریخ انتشار 1997