Electron Paramagnetic Resonance of Oxygen on ZnO and Ultraviolet-Irradiated MgO

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Abstract
A study has been made of the interaction of oxygen with samples of zinc oxide and ultraviolet-irradiated magnesium oxide using electron paramagnetic resonance techniques. Adsorption of oxygen at room temperature results in the rapid formation of a radical species, having gxx=2.077, gyy=2.0011, and gzz=2.0073 for oxygen on irradiated MgO and gxx=2.051, gyy=2.0020, and gzz=2.0082 for oxygen on ZnO. The radical is stable to temperatures of 200°C. The nature of this species is discussed and it is postulated that O2− is the entity adsorbed on the surface.