The two tin oxides, SnO and SnO₂, are not easily distinguished by their core x-ray photoelectron spectroscopic regions, but have significantly different valence-band regions. In addition, significant differences exist in the separations between the near-core region and the valence-band region. These differences are well explained by X{α} calculations.
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Peter M. A. Sherwood (1990) studied this question.
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