Add time:09/24/2019 Source:sciencedirect.com
The interpretation of the spectra of free atoms and gaseous ions in the 4fN and 5fN periods became less active after critical compilations of energy levels appeared. However, several spectra are still under study and the application of the Racah–Slater and HFR methods to extended sets of configurations leads to revisions and additions. In doubly charged ions of lanthanides, the treatment of configuration interaction by means of effective parameters and by extension of the basis of states are both important. Concerning actinides, calculations of several observables (Landé factors and isotope shifts in Pu I, hyperfine constants, transition probabilities) prove the quality of eigenfunctions. The classification of Es I and Es II has been extended and radial parameters for fine and hyperfine structures have been derived. Level predictions for the next element fermium are supported by parameter extrapolations.
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