I Vanadium oxide oxidation states binding energy -- unequal spacing

[sliqu]

TL;DR Summary

Hello,
How come in XPS the binding energy gaps between oxidation states of vanadium oxide are not equally spaced? Is there a reason they are not all equally spaced?

Hello, How come in XPS the binding energy gaps between oxidation states of vanadium oxide are not equally spaced? Is there a reason they are not all equally spaced? V2+ (VO) 513.0 eV V3+ (V2O3) 515.6 eV V4+ (VO2) 516.0 eV V5+ (V2O5) 517.1 eV Many thanks

 

[jim mcnamara]

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[TeethWhitener]

Why would you expect them to be equally spaced? They’re in different chemical environments.