Chemisorption of oxygen on iridium

Abstract

A photoemission and LEED–Auger study has been made to investigate the effect of oxygen adsorption on the electronic and atomic structure of a reconstructed Ir(100) surface. The clean surface is found to have a 5d-band width of 8.0 eV. Origin of an intrinsic surface state and other possible effects of the reconstruction are discussed. Upon adsorption of O₂ an oxygen 2p peak emerges 11.1 eV below the vacuum level. The influence of the electronegativity difference between oxygen and the substrate metal on the photoemission is also considered.