FERMI-SURFACE MAPPING WITH PHOTOELECTRONS AT UV ENERGIES

While photoelectron spectroscopy has been demonstrated to be useful for the determination of Fermi surfaces of two-dimensional systems we discuss the possibility to characterize a fully three-dimensional metal in this manner. Angular distributions of valence photoelectrons at UV energies integrated over a small energy window at the Fermi energy are measured over a large part of the 2pi hemisphere for the case of Cu(001), Cu(111) and Cu(110). They are compared to the model of direct transitions from bulk bands crossing the Fermi energy to empty bands. The observed patterns show the proper translational symmetry with respect to the Brillouin zone (BZ). We conclude that the measurements represent a well defined cut through the Fermi surface.