The adsorption of O on an electrolytic Ag surface was investigated by UPS and by measuring the work function change and kinetics. The UPS difference spectra showed 3 pos. peaks at ~3.0, 5.3, and 9.0 eV below the Fermi level, which are due to the adsorbate resonances of atomic and mol. O on the Ag surface, resp. The peak at 5.3 eV indicates that the orbitals derived from the pg* of mol. O are electronically filled in the adsorbed dioxygen complex, and the peak at 9.0 eV corresponds to electron feedback from the pu of the dioxygen species to valence orbits of Ag. This bonding configuration is also supported by changes in the work function. The kinetic results show a max. (Smax = 9.3 ?10-3) in the sticking coefficient curve at room temperature The temperature effects, S = k ?exp(550/T), were observed by measuring the kinetics, and the results are discussed in terms of precursor adsorption models.

Key words: OXYGEN, SILVER, CALCULATION, REACTION KINETICS, DESORPTION, TEMPERATURE PROGRAMMING DESORPTION, BONDING, CHARGE TRANSFER, POWER FUNCTION, SURFACES ADSORPTION