Energy levels and lifetimes of Nd IV, Pm IV, Sm IV, and Eu IV
V. A. Dzuba, U. I. Safronova, W. R. Johnson
Abstract
To address the shortage of experimental data for electron spectra of triply-ionized rare earth elements we have calculated energy levels and lifetimes of 4fn+1 and 4fn5d configurations of Nd IV (n=2), Pm IV (n=3), Sm IV (n=4), and Eu IV (n=5) using Hartree-Fock and configuration interaction methods. To control the accuracy of our calculations we also performed similar calculations for Pr III, Nd III and Sm III, for which experimental data are available. The results are important, in particular, for physics of magnetic garnets.
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