Abstract
The vacuum polarization potential of order alpha 2(Z alpha ) is evaluated numerically for elements with 1<or=Z<or=100. The finite size of nuclei is taken into account. The nuclear charge distribution is described by a homogeneously charged sphere. The authors compare the resulting energy shift for finite size nuclei with point nucleus values and find a maximum effect of 0.1 eV for K-shell electrons in 100Fm, which represents a 8% modification. This nuclear size effect might be of relevance for future Lamb-shift measurements.
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