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.

arXiv comment9 pages

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• Relativistic coupled cluster calculations of spectroscopic and chemical properties for element 120
• Combination of the single-double coupled cluster and the configuration interaction methods; application to barium, lutetium and their ions
• Enhancement of parity and time invariance violation in Radium atom
• Calculation of energy levels and transition amplitudes for barium and radium
• Fock space relativistic coupled-Cluster calculations of Two-Valence Atoms
• Calculation of the spectrum of the superheavy element Z=120
• Calculation of the spectra of the superheavy element Z=112
• Correlation potential and ladder diagrams
• MCDHF calculations of the electric dipole moment of radium induced by the nuclear Schiff moment
• Multiconfiguration Dirac-Hartree-Fock calculations of transition rates and lifetimes of the eight lowest excited levels of radium
• All-order calculations of the spectra of Ba II, Ra II, Fr I and superheavy elements E119 I and E120 II
• Strongly enhanced atomic parity violation due to close levels of opposite parity
• Absolute frequency measurement of the 7s${}^2$ ${}^1$S${}_0$ $-$ 7s7p ${}^1$P${}_1$ transition in ${}^{225}$Ra

Cited by in corpus (15)

• Opportunities for Fundamental Physics Research with Radioactive Molecules
• Combining configuration interaction with perturbation theory for atoms with large number of valence electrons
• Atomic many-body effects and Lamb shifts in alkali metals
• Approaching meV level for transition energies in the radium monofluoride molecule RaF and radium cation Ra${}^{+}$ by including quantum-electrodynamics effects
• Isotope shift and search for metastable superheavy elements in astrophysical data
• Actinide ions for testing the spatial $\alpha -$variation hypothesis
• Ionization potentials and polarizabilities of superheavy elements from Db to Cn ($Z$=105 to 112)
• The role of QED effects in transition energies of heavy-atom alkaline earth monofluoride molecules: a theoretical study of Ba${}^{+}$, BaF, RaF and E120F
• Compilation of spectroscopic data of Radium (Ra I and Ra II)
• 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)
• Calculation of atomic spectra and transition amplitudes for superheavy element Db (Z=105)
• All-order calculations of the spectra of superheavy elements E113 and E114
• QED radiative corrections to electric dipole amplitudes in heavy atoms
• Calculations of the atomic structure for the low-lying states of actinium