Abstract

AbstractBa compounds behave very unusual in XPS‐studies as they exhibit only small and often negative binding energy shifts. Four different explanations have been given for these observation. To provide a more quantitative basis for these different models and to shed new light on the unusual behaviour of Ba compounds, we calculated total and 1‐projected densities of states for Ba metal and three Ba compounds. All four explanations given up to now are not in qualitative agreement with the obtained results. A different possible explanation is discussed.

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