Electronic interchain interactions of the Cu(110)(2 x 1)O surface - an angle-resolved photoemission study

Using angle-resolved photoemission at homega = 21.2 eV we have measured the electronic energy band dispersion perpendicular to the Cu-O chains, i.e. along the (&UGamma;) over bar - (X) over bar and (Y) over bar - (S) over bar directions of the surface Brillouin zone. Our work treats exclusively the occupied antibonding states observed at binding energies between E-F and the upper edge of the Cu d-bands. We studied both the fully oxygen-covered surface (0.5 ML coverage) and the striped surface (global coverage <0.5 ML), where alternating Cu(1 1 0) and (2 x 1)O domains form a quasi-1D nanograting. In addition we analyze an umklapp-process of bulk substrate emission. It is induced by the (2 x 1) lattice of the adsorbate and needs to be distinguished from oxygen-derived electronic properties. We compare our results with earlier experimental studies and with available surface band structure calculations. (C) 2003 Elsevier B.V. All rights reserved.