QUANTITATIVE ELECTRON MOMENTUM SPECTROSCOPY OF ALUMINUM FILMS

We present measurements of the spectral momentum density of aluminum f ilms and compare these results with two different theories. One theory is a standard band structure calculation, taking into account the lat tice potential; the other theory neglects the lattice potential, but t akes electron-electron correlations approximately into account. Near t he Fermi level, the band structure calculations and jellium-type many- body calculations provide satisfactory results, especially if multiple scattering effects are taken into account. The measured intensity at binding energies exceeding the single-particle band width is too large , even after correction for multiple scattering effects for the band s tructure calculations. The jellium-type many-body calculations have mo re intensity than the band structure-type calculations at higher bindi ng energies. However the sharp satellite features present in this theo ry are not observed in the experiment. (C) 1998 Elsevier Science B.V.