Electronic structure investigation of Cu(110), Ag(110) and Ni(110) surfaces covered with chemisorbed oxygen up to half a monolayer

Angle-resolved photoemission (ARUPS) excited with polarized light is used to investigate the number, energies and symmetries of occupied oxygen-induced surface states as a function of increasing oxygen coverage up to the p(2x1)O added-row structure (corresponding to a half monolayer coverage) on Cu(110) and Ag(110). The dispersions and symmetries of the induced surface bands of the p(2x1)O structure are given for Cu(110) and Ag(110) and are supplemented by those of Ni(110). The experimental bands for all three systems are compared with published results of theoretical calculations. For Cu and Ag, it is observed that the antibonding states of the p(2x1)O structure already exist for the lowest coverage, indicating the immediate formation of -O-Cu(Ag)-O- rows. The observed energy shifts of these states with increasing oxygen coverage are discussed in terms of a repulsive row-row interaction. We also report on a photoemission investigation of the COgas+O-adsorbed-->CO2(gas) clean-off reaction on Ag(110). (C) 1997 Elsevier Science B.V.