Photoelectron Emission and thedBands of Zinc and Cadmium

The $d$ bands of Zn and Cd have been unambiguously located by photoelectron spectroscopy using 40.81-eV radiation. In Zn a single peak due to the $3d_{\frac{3}{2},\frac{5}{2}}$ band of half-width 1.1 eV is found 9.5 eV below Fermi level, while for Cd, the $4d_{\frac{3}{2},\frac{5}{2}}$ doublet is resolved at 10.2 and 11.1 eV below the Fermi level. The relevance of these results for band-structure calculations and for the interpretation of related optical and characteristic energy-loss experiments is discussed.