Abstract
The p(2×2)− C Ni(100) adsorption system belonging to the space group p4g has been studied with UV photoemission using synchrotron radiation. The dispersion of a 2p-derived band can be followed along both principal directions of the surface Brillouin zone. The two C atoms per unit cell in combination with a glide line cause a splitting of the band at Γ and degeneracy at the zone edge. The space group symmetry, however, imposes selection rules on the photoemission process which cannot be derived from point group symmetry alone. The number of observed transitions is reduced and an apparent doubling of the Brillouin zone dimension along Γ X results.
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