The relationship between perturbation theory and direct calculations of rare-earth transition intensities
M. F. Reid, G. W. Burdick, H. J. Kooy
Abstract
We use a simplified calculation to demonstrate the equivalence between three different methods for calculating transition line strengths [B.R. Judd and D. R. Pooler, J. Phys. C 15 (1982) 591; G. W. Burdick and M. F. Reid, Phys. Rev. Lett. 70 (1993) 2491; G. W. Burdick, H. J. Kooy, and M. F. Reid, J. Phys.: Condens. Matter 5 (1993) L323]. These calculations demonstrate the complex interplay between spin-orbit and correlation contributions to two-photon transitions in rare-earth ions.
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