ELECTRONIC BAND-STRUCTURE OF ZINC BLENDE

The electronic bulk and surface band structure of cubic zinc sulphide (''zinc blende'') has been studied by angle-resolved photoelectron spe ctroscopy using synchrotron radiation. The s-p derived bands along the T-K-X high-symmetry direction have been determined, and the region of the Zn 3d line has been examined. Spectra at fixed photon energy and variation of polar electron emission angle were used to determine the dispersion of the surface states along the <(Gamma)over tilde>-(X) ove r bar within the surface Brillouin zone. The experimental data for bul k and surface bands are compared with results of a recent density-func tional calculation, which includes the interaction between the s-p and the cation d-derived states.