Abstract
A numerical calculation, based on full QED, of the energy shift due to the effect of two-photon exchange in the $1s2s{ }^{1}S$ and ${}^{3}S$ states in heliumlike ions is presented. At low Z, the QED effects are compared with the known analytical $(Z\ensuremath{\alpha}{)}^{3}$ contributions, and we find good agreement. The calculations have been performed in the range $Z=10--92.$ Already in the medium-$Z$ range, the effects beyond the leading $(Z\ensuremath{\alpha}{)}^{3}$ order are found to be dominant.
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Schedule a callMore From: Physical review. A, Atomic, molecular, and optical physics
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