EELS at very high energy losses.

In this case, the edges show a clear trend on oxidation whereby the L 3 and L 2 edges have no white lines for the metal, small white lines for tin (II) oxide, and more pronounced white lines for tin (IV) oxide.

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It is doubtful that such a weak trend could be used effectively for mapping oxidation state changes in materials, when the typical individual pixel data is much noisier than these long-acquisition standard spectra.

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