J. Phys. IV France 7 (1997) C2-357-C2-359
Electronic 2p - 3d - 3s-1 Resonant Raman Scattering in 3d Transition Metal SystemsL. Braicovich1, C. Dallera1, G. Ghiringhelli2 and N.B. Brookes3
1 INFM and Dipartimento di Fisica del Politecnico, Piazza Leonardo da Vinci 32, 20133 Milano, Italy
2 INFM and Dipartimento di Fisica del Politecnico, Piazza Leonardo da Vinci 32, 20133 Milano Italy
3 ESRF, BP. 220, F-38043 Grenoble cedex, France
We present Resonant Raman Scattering results with a final-state 3s hole excited across the L3 threshold in NiO and elemental Co. In NiO the spectra are drastically dependent on the excitation energy while this is not the case in Co. This comes from the different correlation properties of the two systems. In particular the NiO results show the final state exchange interaction of the 3d93s1 ionic configuration. However the NiO spectra excited several eV above the L3 threshold can be interpreted in a localized picture only if the relaxation in the intermediate excited state is also considered. The relaxation process converts the excited 2p53d9 configuration to the 2p53d9 configuration which would be obtained with threshold excitation. We suggest that this relaxation is mostly due to the creation of electron-hole pairs across the gap.
© EDP Sciences 1997