Abstract
Oxygen adsorption on reduced is investigated using temperature programed desorption and electron-stimulated desorption. At low temperatures, 2 molecules can be chemisorbed in each oxygen vacancy. These molecules do not desorb upon annealing to 700 K. Instead, for , the 2 convert to another species, which has four oxygen atoms, i.e., tetraoxygen, that decomposes at higher temperatures. In contrast, when only 1 is adsorbed in an oxygen vacancy, the molecule dissociates upon annealing above to heal the vacancy in agreement with previous results.
- Received 11 January 2008
DOI:https://doi.org/10.1103/PhysRevLett.100.196102
©2008 American Physical Society