Physics – Atomic and Molecular Clusters
Scientific paper
1998-11-18
Laser Phys. 2 (1992) 704-710
Physics
Atomic and Molecular Clusters
13 pages, Tex file
Scientific paper
Symmetry adaptation techniques are applied to the determination of the intensity of two-photon absorption transitions, between Stark levels of configurations with opposite parities, for transition ions in finite symmetry environments. The equivalence between third-order mechanisms and second- plus first-order mechanisms is clearly established. A compact formula is derived for the intensity of a two-photon transition between two levels with well-defined symmetries. A set of (selection) rules which controls the number of intensity parameters for inter-configurational transitions is given. The formalism is illustrated with the case of an ion with 4f configuration in tetragonal symmetry.
Daoud Mohamad
Kibler Maurice
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