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• W2143457684 endingPage "2650" @default.
• W2143457684 startingPage "2644" @default.
• W2143457684 abstract "A first-principles relativistic many-body investigation of magnetic hyperfine fields has been carried out for the ground states 4${mathrm{}}^{2}$ ${mathrm{S}}_{1mathrm{/}2}$ of the alkali atom K and doubly charged ion ${mathrm{Sc}}^{2+}$ completing the investigation over the three members of the isoelectronic series K, ${mathrm{Ca}}^{+}$ , and ${mathrm{Sc}}^{2+}$ with a single valence electron in the 4s state, since ${mathrm{Ca}}^{+}$ had been investigated by us previously. This allows one to study both the nature of agreement with experiment over this series as the charge increases and the trends in the contributions from the major mechanisms responsible for the hyperfine fields in these systems. The calculated magnetic hyperfine fields in tesla for K, ${mathrm{Ca}}^{+}$ , and ${mathrm{Sc}}^{2+}$ are 56.81, 135.90, and 239.29, respectively. These agree very well with the measured values of 58.02 T for K and 140.30 T for ${mathrm{Ca}}^{+}$ . No experimental data are available for the ${mathrm{Sc}}^{2+}$ system. The exchange core polarization (ECP) and correlation contributions, as fractions of the valence contribution, are found to decrease rapidly as one goes to systems with higher ionic charges, the decrease being more drastic for correlation effects. The trend of the ratios of ECP and correlation contributions to the valence contribution for both K and ${mathrm{Sc}}^{2+}$ were compared with those calculated for the neighboring alkali-metal systems, sodium and rubidium. The physical explanations for the results and the observed trends in the contributions from the different mechanisms are discussed." @default.
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• W2143457684 date "1997-04-01" @default.
• W2143457684 modified "2023-10-16" @default.
• W2143457684 title "Theory of hyperfine interactions in potassium andSc2+sion:Trends in systems isoelectronic with potassium" @default.
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• W2143457684 doi "https://doi.org/10.1103/physreva.55.2644" @default.
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