Spectroscopic properties of mixed valence compounds are studied using the Anderson impurity model. Recent theoretical developments using the large spin and orbital degeneracy Nf of the f-level are discussed. It is shown how exact results for various spectroscopies can be obtained in the limit Nf to infinity . The behaviour of the f-level spectral density is discussed in detail for T=0. The occurrence of the 'Kondo peak' is shown to reconcile the large values of the coupling Delta between the f-level and the conduction states as obtained by comparison with spectroscopic measurements with former estimates from thermodynamic data. Values for Delta and the f-occupancies, nf, are given for various Ce compounds.
 

Journal of Magnetism and Magnetic Materials, 52 141-6, 1985.