HIGH-RESOLUTION GD 4D PHOTOEMISSION FROM DIFFERENT INTERMETALLIC COMPOUNDS

High-resolution x-ray photoemission from the core 4d Gd level enabled the testing of two possible approaches which can be applied to spin-de pendent interactions. The interaction of the 4d hole with the half-fil led 4f shell, together with spin-orbit coupling, determines the comple x shape of the spectra. It is possible to describe the energy spread o f the multiplet using as well the one electron as the many-electron mo del. The observed intensity ratio of particular lines within the multi plet can be described only partially by the existing models. The first , low-binding-energy lines, which are related to the highly spin-polar ized electronic states, exhibit intensity lower than expected in the m any-electron model. The one-electron model may be applicable for this behavior taking into account possible linear polarization of the x ray s. The behavior of the linewidth of the multiplet components can be ex plained using the lifetime broadening and the analysis of the possible decay channels by the 4d4f4f and 4d5p5p super-Coster-Kronig process.