Abstract
Using a Sturmian-like expansionof the (first-order) Dirac Coulomb Green'sfunction, the two-photonprobability amplitude for the|12S1/2⟩ → |22S1/2⟩transition in hydrogenic systems is calculated as a functionof nuclear charge Z. A comparison between relativistic andnon-relativistic treatments is made, taking care ofthe influence of retardation in both cases.
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