CRITICAL-POINT ENERGIES DETERMINED BY ANGLE-RESOLVED UV PHOTOEMISSIONFROM SC(0001)

We report the first angle-resolved UV photoemission study of the rare earth metal Sc(0001). Normal-emission photoelectron spectra recorded i n the 20-50 eV photon energy range using synchrotron radiation have be en compared to spectra calculated by a one-electron photocurrent code. Emission from the GAMMA1+ and GAMMA4- critical points of the band str ucture occurs at binding energies of 4.65 +/- 0.1 eV and 1.85 +/- 0.1 eV, respectively. Comparison of the GAMMA1+ binding energy with values determined for other rare earth metals shows a relationship to the la ttice parameter.