scattering vector 

https://doi.org/10.1351/goldbook.S05494
The vector difference between the wave propagation vectors of the incident and the scattered beam, both of length 2 πλ, where λ is the wavelength of the scattered radiation in the medium.
Source:
Purple Book, 1st ed., p. 65 [Terms] [Book]
Citation: 'scattering vector' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.S05494 RIS BibTex EndNote
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Last revised: February 24, 2014