scattering geometry

https://doi.org/10.1351/goldbook.08677
Relation between the propagation directions, ki, ks, and the polarization directions, pi, ps, of the incident and scattered radiation, usually expressed in terms of laboratory-fixed or crystal-fixed Cartesian axes.
Note:
A common notation, due to Porto, is ki(pips)ks.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 763 [Terms] [Paper]