scattering vector

https://doi.org/10.1351/goldbook.S05494
The vector difference between the wave @P04881@ vectors of the incident and the scattered beam, both of length \(\frac{2\ \pi }{\lambda }\), where \(\lambda \) is the @W06659@ of the scattered radiation in the medium.
Source:
Purple Book, 1st ed., p. 65 [Terms]