Spectra of barium, radium, and element 120; application of the combined correlation potential, singles-doubles, and configuration interaction ab initio method

Abstract

We apply a version of the recently developed approach combining the correlation potential, linearized singles-doubles coupled-cluster, and the configuration interaction methods to the spectra of the heavy alkaline earths barium, radium, and element 120. Quantum electrodynamics radiative corrections are included. We have found unprecedented agreement between ab initio theory and experiment for the spectra of barium and radium, and we make accurate predictions for missing and unreliable data for all three atoms.

9 pages

References in corpus (7)

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• Development of a configuration-interaction + all-order method for atomic calculations
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• Calculation of energy levels and transition amplitudes for barium and radium
• Fock space relativistic coupled-Cluster calculations of Two-Valence Atoms
• Multiconfiguration Dirac-Hartree-Fock calculations of transition rates and lifetimes of the eight lowest excited levels of radium
• Absolute frequency measurement of the 7s${}^2$ ${}^1$S${}_0$ $-$ 7s7p ${}^1$P${}_1$ transition in ${}^{225}$Ra

Cited by in corpus (8)

• Opportunities for Fundamental Physics Research with Radioactive Molecules
• Combining configuration interaction with perturbation theory for atoms with large number of valence electrons
• Approaching meV level for transition energies in the radium monofluoride molecule RaF and radium cation Ra${}^{+}$ by including quantum-electrodynamics effects
• The role of QED effects in transition energies of heavy-atom alkaline earth monofluoride molecules: a theoretical study of Ba${}^{+}$, BaF, RaF and E120F
• Generalized relativistic small-core pseudopotentials accounting for quantum electrodynamic effects: construction and pilot applications
• Electron structure of superheavy elements Uut, Fl and Uup ($Z$=113 to 115)
• All-order calculations of the spectra of superheavy elements E113 and E114
• QED radiative corrections to electric dipole amplitudes in heavy atoms