Abstract
Since ionization loss spectroscopy (ILS) and disappearance potential spectroscopy (DAPS) may respond in different ways to the changing chemical environment if Coulomb correlation effects are not negligibly small, we chose strongly correlated materials La, Ce and narrow band-materials Cr, Ti and followed their oxidation processes by ILS and DAPS. It was found that generally with DAPS the changes in peak energies were greater than with ILS during oxidation, especially for La, Ce and Cr. Further analyses showed that the difference of the peak positions of DAPS and ILS contained three items of Coulomb correlation energies. The data for this difference versus oxygen exposure could be consistently interpreted for La and Ce in terms of the previous X-ray photoelectron spectroscopy-Bremsstrahlung isochromat spectroscopy (XPS-BIS) results.
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