  Valence-band ultraviolet photoemission spectroscopy (UPS) at 173K and 6p
core-level X-ray photoemission spectroscopy (XPS) at room temperature were
performed on a high quality uranium single crystal. Significant agreement is
found with first-principles electronic band-structure calculations, using a
generalized gradient approximation (GGA). In addition, using Low Energy
Electron Diffraction (LEED) for the (001) surface, we find a well-ordered
orthorhombic crystallographic structure representative of the bulk material.
