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Figure 4
(a) Quantitative map of polystyrene, from a slice (50 nm; one voxel thick) through the centre of the capillary extracted from the 3-d volume of 530 eV data. The optical density (OD) scale for the full 3-d data set is derived from the measured transmission intensity using Beers law. This OD scale is preserved through the data processing, thus resulting in a quantitative OD scale for the extracted slice. (b) Quantitative map of polyacrylate, from a slice through the 3-d volume of the image differences. The thickness scale is derived from the OD difference signal using the O 1s spectrum of polyacrylate plotted in Fig. 3[link], which was placed on an absolute linear absorbance scale (OD nm−1) by matching the spectrum to the elemental response outside of the structured near-edge region. Since only polyacrylate contributes to the OD difference signal, only the thickness of polyacrylate is obtained. (c) A color-coded overlay of the polyacrylate map on the PS map. Scale bar = 2 µm.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 14| Part 5| August 2007| Pages 395-402
doi:10.1107/S0909049507029962
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