The two-time Green's Function and screened Self-Energy for two-electron quasi-degenerate States
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Precise predictions of atomic energy levels require the use of QED, especially in highly-charged ions, where the inner electrons have relativistic velocities. We present an overview of the two-time Green's function method; this method allows one to calculate level shifts in two-electron highly-charged ions by including in principle all QED effects, for any set of states (degenerate, quasi-degenerate or isolated).
7 pages, 3 figures, to appear in the Proceedings of the Hydrogen II conference held in Castiglione della Pescaia, Italy (S. G. Karshenboim et al., eds)
7 pages, 3 figures, to appear in the Proceedings of the Hydrogen II conference held in Castiglione della Pescaia, Italy (S. G. Karshenboim et al., eds)