Calculation formulas for the reducible part of the two-photon-exchange diagrams in the QED of multicharged ions
- 1 June 1994
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 49 (6), 4489-4501
- https://doi.org/10.1103/physreva.49.4489
Abstract
A simple method for deriving the energy level shifts in the QED of multicharged ions is considered. Calculation formulas for the reducible part of the two-photon-exchange diagrams in both the Feynman and the Coulomb gauges are derived for arbitrary states of two-electron multicharged ions. The final expressions for this contribution have a form that is convenient enough for numerical calculations.Keywords
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