4D RESONANT INELASTIC X-RAY-SCATTERING IN GADOLINIUM

Resonance inelastic x-ray scattering (RIXS) involving selective excita tions to Gd 4d(9)5p(6)4f(n+1) intermediate states has been measured. A n x-ray resonant Raman effect is clearly identified for excitation to states below the 4d ionization threshold. RIXS spectra have been calcu lated for several excitation energies and provide a good quantitative explanation for the large variation in the 5p-->4d branching ratio int ensities observed as a function of excitation energy. Weak structure o bserved close to the elastic peak is identified as the result of spin- flip scattering.