Rigorous quantum electrodynamics treatment of electron correlations in high-Z ions: Beyond the Breit and effective-potential approximations

V. A. Yerokhin Max-Planck-Institut für Physik Komplexer Systeme Nöthnitzer Straße 38, D-01187, Dresden, Germany; Institute for High Performance Computing and Data Bases, Fontanka 118, St Petersburg, 198005, Russia

A. N. Artemyev Centro de Química Instituto Venezolano de Investigaciones Científicas, Apartado 21827, Caracas 1020-A, Venezuela

V. M. Shabaev Max-Planck-Institut für Physik Komplexer Systeme Nöthnitzer Straße 38, D-01187, Dresden, Germany; Department of Physics, St Petersburg State University, Oulianovskaya 1, Petrodvorets, St Petersburg, 198904, Russia

M. M. Sysak Department of Physics, St Petersburg State University, Oulianovskaya 1, Petrodvorets, St Petersburg, 198904, Russia

O. M. Zherebtsov Department of Physics, St Petersburg State University, Oulianovskaya 1, Petrodvorets, St Petersburg, 198904, Russia

G. Soff Institut für Theoretische Physik Technische Universität Dresden, MommsenstraßBe 13, D-01062, Dresden, Germany

Abstract

We discuss the present status of auantum electrodynamics (QED) investigations of electron correlations in second order in α for heavy fewelectron atoms. A complete evaluation of all two-electron QED contributions of order α² is presented for the 2p_½-2s transition in high-Z Li-like ions. In particular, the two-photon exchange correction beyond the Breit approximation is calculated for highly charged ions with Z < 50. The total theoretical value of 280.44(9)(20) eV is found for the 2p_½-2s transition energy in Li-like U.

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Rigorous quantum electrodynamics treatment of electron correlations in high-Z ions: Beyond the Breit and effective-potential approximations

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Rigorous quantum electrodynamics treatment of electron correlations in high-Z ions: Beyond the Breit and effective-potential approximations

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