Core correlation effects in multiconfiguration calculations of isotope shifts in Mg I

Abstract

The present work reports results from systematic multiconfiguration Dirac-Hartree-Fock calculations of isotope shifts for several well-known transitions in neutral magnesium. Relativistic normal and specific mass shift factors as well as the electronic probability density at the origin are calculated. Combining these electronic quantities with available nuclear data, energy and transition level shifts are determined for the ${}^{26}$Mg${-}^{24}$Mg pair of isotopes. Different models for electron correlation are adopted. It is shown that although valence and core-valence models provide accurate values for the isotope shifts, the inclusion of core-core excitations in the computational strategy significantly improves the accuracy of the transition energies and normal mass shift factors.

arXiv comment2 figures, submitted to Physical Review A

References in corpus (4)

• Tensorial form and matrix elements of the relativistic nuclear recoil operator
• Improved calculation of relativistic shift and isotope shift in Mg I
• A Partitioned Correlation Function Interaction approach for describing electron correlation in atoms
• Theoretical isotope shifts in neutral barium

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