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Figure 1
(Top) An optical density image of the stack region on FIB section 1B, sourced from the rim of the pellet, taken at 535 eV (pixel size 50 nm). The red numbers indicate the approximate location of the first and last regions from the central hole. (Bottom) Spectra taken from six different regions (determined by cluster analysis) on FIB section 1B. The blue trace is nearest to a defect in the sample, the intermediate regions are orange, green, red and purple in order of increasing distance from the defect, and the brown trace is furthest from the defect in the sample. The arrows indicate how the spectra change with increasing distance from the defect. These spectra show isosbestic points (black circles), which are a clear indicator of a mixture of only two different oxygen species. Isosbestic points are located at 531.5, 535.3 and 536.9 eV.

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ISSN: 1600-5775
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