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Electron self-energy contributions to the ionization potentials of alkali-metal atoms: application of the model-QED operator
Russian version
Dulaev N. K.1,2, Tupitsyn I. I.1, Prokhorchuk E. A.1, Usov D. P.1, Yang P.1,3,4, Malyshev A. V.1,2, Shabaev V. M.1,2
1St. Petersburg State University, St. Petersburg, Russia
2Konstantinov Petersburg Nuclear Physics Institute, National Research Center Kurchatov Institute, Gatchina, Russia
3University of Chinese Academy of Sciences, Beijing, China
4Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan, China
Email: dusov3186@gmail.com
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Within the framework of the approach based on the model-QED operator, the electron self-energy contributions to the ionization potentials of several alkali-metal atoms (sodium, potassium, rubidium, and cesium), as well as ions with corresponding electronic configurations, have been calculated. A comparison with the results of ab initio calculations to the leading order of perturbation theory for different choices of initial approximation is performed. A good agreement between the two approaches is obtained. It is demonstrated that the strong dependence of the obtained results on the choice of the zeroth-order Hamiltonian can be eliminated only by combining the method of the model-QED operator with the configuration-interaction method, which provides a more accurate treatment of electron-electron correlation effects. Keywords: quantum electrodynamics, model-QED operator, self-energy, alkali-metal atoms, ionization potentials.
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