Abstract
A term analysis of the solid‐state spectra of trivalent neodymium and erbium has been made and this has allowed terms to be assigned to most of the observed levels of these ions. The complete spin‐orbit matrices, with the addition of the electrostatic interaction energies, corresponding to the f3 and f11 configurations have been diagonalized to calculate the energy level schemes for the neodymium and erbium ions, respectively. The appropriate parameters were calculated by a least‐squares method.

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