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Figure 3
(a) Scattering from a model containing a gold core and silica shell (inset) calculated using CRYSOL assuming the sample concentration of 1 mg ml−1. Blue solid line: scattering far from the gold absorption edge; red circles depict the extracted anomalous contribution. Oscillations are present due to strong scattering contrast between the gold core and silica shell. The solid red line represents the theoretical scattering from a sphere with a radius r = 5 nm that coincides with extracted scattering from a gold core of the same size. (b) Radius of gyration computed for a set of modelled curves around the absorption edge of gold (11919 eV). The peak value corresponds to the edge position (dashed line). Errors are smaller than the symbol size. (c) Contrast of the gold core at different energies.

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