Ionization energies along beryllium isoelectronic sequence

Abstract

Ionization energies for the ground state of berylliumlike ions with nuclear charge numbers in the range Z=16-96 are rigorously evaluated. The calculations merge the ab initio QED treatment in the first and second orders of the perturbation theory in the fine-structure constant $\alpha$ with the third- and higher-order electron-correlation contributions evaluated within the Breit approximation. The nuclear recoil and nuclear polarization effects are taken into account. The accuracy of the ionization energies obtained has been significantly improved in comparison with previous calculations.

24 pages, 2 figures, 4 tables. arXiv admin note: text overlap with arXiv:1410.1961

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• Relativistic calculations of the ground and inner-L-shell excited energy levels of berylliumlike ions
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• Ab initio calculations of energy levels in Be-like xenon: strong interference between electron-correlation and QED effects
• QED calculation of electron-electron correlation effects in heliumlike ions
• QED radiative corrections to the ${}^2$P${}_{1/2}$-${}^2$P${}_{3/2}$ fine-structure in fluorinelike ions
• Redefined vacuum approach and gauge-invariant subsets in two-photon-exchange diagrams for a closed-shell system with a valence electron
• Testing strong-field QED to second-order in the highly correlated atomic system berylliumlike Pb78+ by electron-ion recombination spectroscopy
• Precise determination of the 2s22p5-2s2p6 transition energy in fluorine-like nickel utilizing a low-lying dielectronic resonance
• QED approach to valence-hole excitation in closed shell systems
• Insight into the prospective evaluation of third-order interelectronic corrections on Li-like ions