Chemical Shifts in the Auger Spectrum of Yttrium on Oxygen Adsorption

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Abstract
Adsorption of monolayer amounts of oxygen on yttrium films and molybdenum foil was studied with Auger electron spectroscopy. Exposure of yttrium to 0.3–15×10−6 Torr sec of oxygen resulted in the growth of new Auger peaks shifted by about −4 eV from the yttrium metal peaks involving the 4p, 4d, and valence levels. For molybdenum these levels were unaffected by oxygen adsorption. A background correction technique was applied in order to remove the effects of secondary electron emission from the data. The growth of the shifted peaks is followed in the spectra and the results are discussed in terms of the electronic structure of the metal and its oxide.

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