Abstract
The noncrossing approximation (NCA) for solving an impurity problem of interacting electrons is applied to the dynamical mean field theory for a d -electron system on cubic lattices. Anisotropy in the hopping integrals as well as intraatomic Coulomb interactions and the crystalline field splitting of d orbitals are fully considered. Single-particle excitation spectra are calculated for various occupations of the d band and discussed with reference to the multiplet spectra obtained in the NCA calculation and the k -dependent spectra. Differences in the results of the NCA and the iterative perturbation theory are discussed.
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