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The multi-configuration Dirac-Hartree-Fock method was employed to calculatethe total and excitation energies, oscillator strengths and hyperfine structureconstants for low-lying levels of Sm I. In the first-order perturbationapproximation, we systematically analyzed correlation effects from eachelectrons and electron pairs. It was found that the core correlations are ofimportance for physical quantities concerned. Based on the analysis, theimportant configuration state wave functions were selected to constitute atomicstate wave functions. By using this computational model, our excitationenergies, oscillator strengths, and hyperfine structure constants are in betteragreement with experimental values than earlier theoretical works.

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