Investigation of the electronic structure of Ni by angle-resolved uv photoelectron spectroscopy

The band structure of Ni has been determined from angle-resolved uv photoelectron spectra, mainly by exploiting the dispersion of direct-transition peaks as the emission angle is changed. Starting from energy-coincidence-determined band-structure points and critical-point values from synchrotron-radiation investigations in the literature, the parameters of a combined interpolation scheme were systematically fitted to give good overall agreement with our experimental data. The resulting semiempirical band structure is characterized by a $d$-band narrowing of about 30%, in good agreement with several earlier investigations. For specific $\overrightarrow{\mathrm{k}}$ points, small deviations from the earlier results were observed. The analysis is less dependent on assumptions concerning the final-state dispersion and the presented measurements are largely complementary to the earlier ones.