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188宝金博页面版: Quantum electrodynamic effects in atomic structure

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内容提示: Theor Chim Acta (1991) 80:207-214 Theoretica Chimica Acta ? Springer-Verlag 1991 Quantum electrodynamic effects in atomic structure Paul Indelicato* and Peter J. Mohr National Institute of Standards and Technology, Gaithersburg, MD 20899, USA Received February 1, 1991/Accepted February 20, 1991 Summary. In high-Z atoms, quantum electrodynamic (QED) corrections are an important component in the theoretical prediction of atomic energy levels. The main QED effects in electronic atoms are the one-electron sel...

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Theor Chim Acta (1991) 80:207-214 Theoretica Chimica Acta © Springer-Verlag 1991 Quantum electrodynamic effects in atomic structure Paul Indelicato* and Peter J. Mohr National Institute of Standards and Technology, Gaithersburg, MD 20899, USA Received February 1, 1991/Accepted February 20, 1991 Summary. In high-Z atoms, quantum electrodynamic (QED) corrections are an important component in the theoretical prediction of atomic energy levels. The main QED effects in electronic atoms are the one-electron self-energy and vacuum-polarization corrections which are well known. At the next level of precision, estimates of the effect of electron interactions on the self energy and higher-order effects in two exchanged photon corrections are necessary. These corrections can be evaluated within the framework of QED in the bound interaction picture. For high-Z few-electron atoms, this approach provides a rapidly converging series in 1/Z for the corrections, which is the generalization of the well-known relativistic 1/Z expansion methods. This paper describes recent work on the effect of electron interactions on the self energy. The QED effects are particularly important for the theory for lithiumlike uranium where an accurate measurement of the Lamb shift has been made, as well as for numerous other cases where systematic differences appear between theory that does not include these QED effects and experiment. Key words: High-Z atoms - QED effects - Lithiumlike uranium - Self energy - Lamb shift 1. Introduction The basis for atomic structure theory presently appears to be bound-state quantum electrodynamics (QED). With suitable approximations to the perturba- tion expansion and infinite summations of subsets of Feynman diagrams, one can recover the usual starting points for calculations such as the Schr6dinger equation or the no-pair~relativistic Hamiltonian for many-electron systems. This workshop is a testimony to the level of sophistication to which calculations based on such equations have been developed. One might ask the complementary question: If no approximations whatso- ever are made to the equations of bound-state QED, how far can the calculations * Permanent address: LPAN, University Pierre et Marie Curie, 4 Place Jussieu, F-75252 Paris Cedex 05, France

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