Reactions of oxygen atoms and molecules with Au, Be and W surfaces.
In this study, the adsorption of atomic oxygen on polycrystalline gold, tungsten and single crystalline beryllium (0001) surfaces is investigated at room temperature and compared with molecular energy. The O atoms are produced by microwave discharge in pure O2. The gaseous reactants effuse into a UHV chamber. The adsorption or chemical reaction of the oxygen atoms and molecules impinging on the metal surfaces is monitored by X-ray photoelectron spectrometry (XPS). The main observations of this study are summarized as follows. The gold surface is inert to molecular oxygen and is also oxidized by both species. The rate of oxide formulation is significantly larger for O atoms. In the case of tungsten, there is no difference between atoms and molecules in the amount of oxygen adsorbed. Neither species, however, forms any phase of tungsten oxide. Only tungsten binding energies characteristic of the pure metal and for oxygen adsorbed within the first atomic layer are detected.
Bibliographic Reference: Article: Surface Science 454-456 (2000) pp. 305-309
Availability: Surface Science (Journal)
Record Number: 200012731 / Last updated on: 2000-09-08
Original language: en
Available languages: en