ANGLE-RESOLVED UPS STUDY OF THE ELECTRONIC-STRUCTURE OF THE CHEMISORPTION SYSTEM NI(110)-P(2X1)O

Abstract

The electronic structure (band structure) of chemisorbed oxygen on a Ni(110) surface with an ordered p(2 X 1) structure has been studied by angle-resolved photoelectron spectroscopy (ARUPS) using polarized synchrotron radiation. The dispersions of the two-dimensional energy bands induced by the absorbed atomic oxygen are in agreement with an ``missing-row'' (or ``added-row'') reconstruction of the Ni(110) surface and can be described in terms of interactions of the oxygen 2p states with the nearest-neighbor nickel atoms along the Ni-O-Ni rows on the Ni substrate. The results compare well with those found for the similar system Cu(110)-p(2 X 1)O and disagree with those derived in a recent ARUPS study of another group. Further, our dispersions are in qualitative agreement with a recent electronic structure calculation for thin Ni(110)-p(2 C 1)O films with a ``missing-row'' structure.