Abstract
The basic idea how three-beam diffraction can be used for physical determination of phase relations originates from (1949). He proposed to exploit the diffracted intensity when two Bragg reflections are simultaneously excited. This situation is called three-beam diffraction since besides of the forwardly transmitted two additional diffracted rays, in total three strong rays, are simultaneously be propagated (cf. Figure 1). More generally, N-beam diffraction occurs when besides of the origin N-1 nodes of the reciprocal lattice lie very close to or on the Ewald sphere.
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Hümmer, K., Weckert, E. (1996). Determination of Reflection Phases by Three-Beam Diffraction. In: Authier, A., Lagomarsino, S., Tanner, B.K. (eds) X-Ray and Neutron Dynamical Diffraction. NATO ASI Series, vol 357. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-5879-8_24
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