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Anomalous and resonance small‐angle scattering
Author(s) -
Epperson J. E.,
Thiyagarajan P.
Publication year - 1988
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889888007551
Subject(s) - scattering , small angle scattering , biological small angle scattering , neutron , neutron scattering , physics , anomalous scattering , resonance (particle physics) , small angle neutron scattering , computational physics , formalism (music) , scattering length , absorption edge , atomic physics , optics , nuclear physics , condensed matter physics , art , musical , band gap , visual arts
Significant changes in the small‐angle scattered intensity can be induced by making measurements with radiation close to an absorption edge of an appropriate atomic species contained in the sample. These changes can be related quantitatively to the real and imaginary anomalous‐dispersion terms for the scattering factor (X‐rays) or scattering length (neutrons). The physics inherent in these anomalous‐dispersion terms is first discussed before consideration of how they enter the relevant scattering theory. Two major areas of anomalous‐scattering research have emerged; macromolecules in solution and unmixing of metallic alloys. Research in each area is reviewed, illustrating both the feasibility and potential of these techniques. All the experimental results reported to date have been Obtained with X‐rays. However, it is pointed out that the formalism is the same for the analog experiment with neutrons, and a number of suitable isotopes exist which exhibit resonance in an accessible range of energy. Potential applications of resonance small‐angle neutron scattering are discussed.