UPS和功函数研究氧在电解银上的吸附

本文报导了用紫外光电子能谱(UPS), 热脱附(TDS)和表面功函数连续测量等手段对氧与电解银表面相互作用过程中的电荷传递, 成键以及吸附动力学等研究的实验结果。

Adsorption of oxygen on electrolytic silver by UPS and work function

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.