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Figure 1
Schematic representation of a scattering experiment. (a) An incident beam is shown scattering from two point scatterers (represented by the black dots) within a globular macromolecule. The diffracted rays are in phase with each other but out of step by λ at the scattering angle [2{\rm{\theta }}] shown, causing constructive interference. The accumulation of these events at low angles gives rise to the scattering pattern of the macromolecule. (b) In a typical small-angle scattering experiment, diffraction from high-scattering-density macromolecules in a low-scattering-density solution gives rise to a scattering pattern on an area detector. q is the scattering vector [{{\bf k}_{\rm s}}- {{\bf k}_{\rm i}}]. The radial average of the scattering pattern about the position of the direct main beam gives rise to the scattering curve I(Q) in reciprocal space.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 48| Part 3| June 2015| Pages 953-961
https://doi.org/10.1107/S1600576715007062
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