Crossed-second-order specific-mass isotope shift in the Nickel atom |
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Authors: | A L A Fonseca J Bauche |
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Institution: | 1. Laboratoire Aimé Cotton, CNRS II, ORSAY, France
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Abstract: | The crossed-second-order corrections to the specific mass shifts of the lowest terms of the two lowest configurations of the Nickel atom are evaluated ab initio in the Multiconfigurational Hartree-Fock scheme. The excitations towards the nf(l=3) empty subshells play the major role. If the contributions obtained are added to the Hartree-Fock values, the discrepancy between experiment and theory for the 3d 8 4s 2?3d 9 4s (virtual) transition is only reduced by one third. As concerns the differences between the specific shifts of the five Russell-Saunders terms of 3d 8 4s 2, the crossed-second-order contributions are predicted to be practically as large as the Hartree-Fock values, which makes the total definitely measurable. |
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