Multiconfiguration Dirac-Hartree-Fock calculations of excitation energies, oscillator strengths, and hyperfine structure constants for low-lying levels of Sm I

Abstract

The multiconfiguration Dirac-Hartree-Fock method was employed to calculate the total and excitation energies, oscillator strengths, and hyperfine structure constants for low-lying levels of Sm i. In the first-order perturbation approximation, we systematically analyzed correlation effects from individual electrons and electron pairs. It was found that the core correlations are of importance for the physical quantities concerned. Based on the analysis, the important configuration state wave functions were selected to constitute atomic state wave functions. By using this computational model, our excitation energies, oscillator strengths, and hyperfine structure constants are in better agreement with experimental values than earlier theoretical works.