Abstract

The Judd-Ofelt theory [1] has been successfully used in the interpretation of rare-earth 4f↔4f intensities. It is a common practice in this theory to express the oscillator between two J-manifolds, belonging to the ground 4f^N configuration, as a function of three intensity parameters Ω_λ (λ= 2, 4, 6). If these parameters are treated phenomenologicaly, besides the eletric-dipole mechanism other contributions are automaticaly absorved making it impossible to distinguish between them. Among these contributions, the Pseudo-Multipolar Field has been shown to be of particular importance [2,3]. Vibronic as weel as correlation effects may also be of relevance. It is, therefore, of interest to perform theoretical calculations in order to assesss the relative contribution of each of these mechanisms.

© 1984 Optical Society of America