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Combining quantum electrodynamics and electron correlation

Kapitel i bok
Författare Ingvar Lindgren
Sten Salomonson
Daniel Hedendahl
Johan Holmberg
Publicerad i Nuclear Physics: Present and Future
Sidor 287-295
ISBN 978-33-19-10199-6
Förlag Springer
Publiceringsår 2015
Publicerad vid Institutionen för fysik (GU)
Sidor 287-295
Språk en
Länkar dx.doi.org/10.1007/978-3-319-10199-...
Ämneskategorier Kärnfysik

Sammanfattning

There is presently a large interest in studying highly charged ions in order to investigate the effects of quantum-electrodynamics (QED) at very strong fields. Such experiments can be performed at large accelerators, like that at GSI in Darmstadt, where the big FAIR facility is under construction. Accurate experiments on light and medium-heavy ions can also be performed by means of laser and X-ray spectroscopy. To obtain valuable information, accurate theoretical results are required to compare with. The most accurate procedures presently used for calculations on simple atomic systems are (i) all-order many-body perturbative expansion with added first-order analytical QED energy corrections, and (ii) two-photon QED calculations. These methods have the shortcoming that the combination of QED and correlational effects (beyond lowest order) is completely missing. We have developed a third procedure, which can remedy this shortcoming. Here, the energy-dependent QED effects are included directly into the atomic wave function, which is possible with the procedure that we have recently developed. The calculations are performed using the Coulomb gauge, which is most appropriate for the combined effect. Since QED effects, like the Lamb shift, have never been calculated in that gauge, this has required some development. This is now being implemented in our computational procedure, and some numerical results are presented. © Springer International Publishing Switzerland 2015.

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