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![[Figure 1]](roo5002fig1mag.jpg)
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Figure 1
The parameter scheme of van de Hulst (1957  ; see p. 132, Fig. 20), adapted for this work. The horizontal axis is connected to the typical phase shift, i.e. the typical path difference given by the colloidal size and the wavelength. The vertical axis scales with the dimensionless contrast, i.e. the SLD difference scaled with the wavelength, which in optics is directly connected to the refractive index difference n − 1. The theory classification is indicated by areas as follows: (1) Rayleigh–Gans or first-order Born approximation, (2) anomalous diffraction or WKB approximation, (3) large spheres, (4) total reflector, (5) optical resonance and (6) Rayleigh scattering. Transition regions are indicated by two numbers. The green area indicates the transition range between (1) and (2) where coherent multiple scattering dominates. Under these circumstances, surface scattering dominates, i.e. the scattering emerges from the surface of the structure. |
![[Figure 1]](roo5002fig1.jpg)
 | JOURNAL OF APPLIED CRYSTALLOGRAPHY |
ISSN: 1600-5767
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