small-angle X-ray scattering

mentioned: wide-angle X-ray scattering (WAXS)
https://doi.org/10.1351/goldbook.09203
Measurement method in which the elastically scattered intensity of X-rays is measured for small-angle deflections.
Notes:
  1. Angular scattering is usually measured within the range \(\pu{0.1\!^{\circ}}\) to \(\pu{10\!^{\circ}}\). This provides structural information on macromolecules, as well as periodicity on length scales typically larger than \(\pu{5 nm}\) and less than \(\pu{200 nm}\) for ordered or partially ordered systems.
  2. Wide-angle X-ray scattering (WAXS) is an analogous technique, similar to X-ray crystallography, in which scattering at larger angles, which is sensitive to periodicity on smaller length scales, is measured.
  3. The X-ray source can be a synchrotron, in which case the term synchrotron radiation small-angle X-ray scattering (SRXAS) is occasionally encountered.
Source:
PAC, 2020, 92, 1781. 'Glossary of methods and terms used in surface chemical analysis (IUPAC Recommendations 2020)' on page 1792 (https://doi.org/10.1515/pac-2019-0404)