Evaluation of two-photon exchange graphs for the helium isoelectronic sequence
- 1 January 1989
- proceedings article
- Published by AIP Publishing in AIP Conference Proceedings
- Vol. 189 (1) , 196-205
- https://doi.org/10.1063/1.38427
Abstract
Two‐photon exchange graph contributions to the ground state energy of two‐electron ions are evaluated in Furry picture QED. The natural separation of correlation effects from negative energy state effects is demonstrated. Some of these latter effects are evaluated both analytically and numerically, and shown to contribute at the level (Zα)3 a.u.Keywords
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