SIMPLE PARAMETRIZATION SCHEME FOR ELECTRIC-DIPOLE INTENSITIES

A simple phenomenological model for the electric dipole intensities of nf --> nf transitions is proposed. The model is derived by adopting o f the common angular overlap model to the generalized Judd-Ofelt theor y of the static coupling mechanism. It leads to reduction of a number of the effective intensity parameters to six, three of which correspon d to the f --> d excitations and the remaining to the f --> g ones. Ca lculations performed for some lanthanide complexes show that the model , despite its inborn crudeness, provides satisfactory results and may be a convenient tool for a preliminary estimation of intensities. Regu larity of the obtained parameters indicates a possibility of further r eduction of their number.