SPECTRAL CORRESPONDENCE TO THE EVOLUTION OF CHEMICAL-BOND AND VALENCE-BAND IN OXIDATION

Spectroscopy covering energies around Fermi level of a metal is of par ticular interest as it does give direct information of bond forming an d its consequence on the energy states (DOS). However, the origin of s ome outstanding spectral features from metal surface with chemisorbed oxygen has not yet been well established. It is shown in this letter t hat a bond-to-band model for oxidation enables the nature of a sum of spectral features to be consistently defined. All the spectral changes in the STS, XPS, UPS, photoemission spectroscopy (PES) and the therma l desorption spectroscopy (TDS) are classified by four DOS features ar ound Fermi level and three bonding processes. Such a definition leads not only to new knowledge of the nature of O-metal interaction but als o to a direct understanding of the bond-and-band forming dynamics.