Title: Guinier plot
Long Title: IUPAC Gold Book - Guinier plot
DOI: 10.1351/goldbook.G02712
Status: current

Definition
A diagrammatic representation of data on scattering from large particles, obtained at different angles but at the same concentration, constructed by plotting \(\log _{10}\Delta R\left(\theta \right)\) or \(\log _{10}P\left(\theta \right)\) versus \((\sin \frac{\theta}{2})^{2}\) or \(q^{2}\) and (usually) used for the evaluation of the radius of gyration. \(\Delta R(\theta)\) is the excess Rayleigh ratio, \(P\left(\theta \right)\) the particle scattering function, \(\theta \) the scattering angle and \(q\) the length of the scattering vector.

Related Terms
- excess Rayleigh ratio: https://goldbook.iupac.org//terms/view/E02236
- particle scattering function: https://goldbook.iupac.org//terms/view/P04429
- radius of gyration: https://goldbook.iupac.org//terms/view/R05121
- scattering: https://goldbook.iupac.org//terms/view/S05487
- scattering angle: https://goldbook.iupac.org//terms/view/S05488
- scattering vector: https://goldbook.iupac.org//terms/view/S05494

Source
- Purple Book, 1st ed., p. 67 (http://old.iupac.org/publications/books/author/metanomski.html)

Other Outputs
- html: https://goldbook.iupac.org/terms/view/G02712/html
- json: https://goldbook.iupac.org/terms/view/G02712/json
- xml: https://goldbook.iupac.org/terms/view/G02712/xml

Citation: Citation: 'Guinier plot' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. 10.1351/goldbook.G02712
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Accessed: 2026-07-13T12:13:10+00:00