MULTIPLET STRUCTURE IN HIGH-RESOLUTION AND SPIN-RESOLVED X-RAY PHOTOEMISSION FROM GADOLINIUM

Spin-resolved and high-energy-resolution x-ray-photoelectron spectra o f the 3d, 4d, 4f, and 5p levels of ferromagnetic Gd are reported. The experimental spectra are compared with theoretical predictions for bul k Gd based on atomic multiplet calculations. The agreement is quite go od when the Slater integrals are reduced to 75-95% of their atomic Har tree-Fock values. It is found that the lifetime broadening of the Gd c ore states is not governed solely by the spin character of the core ho le. Amazingly narrow lifetime widths on the order 0.25-0.30 eV half-wi dth at half maximum are found for the deeply bound Gd 3d features. The differences between the spectral structures of the 3d, 4d, and 5p cor e levels can be ascribed to the details of spin and orbital angular mo mentum coupling between the core and 4f shells.