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Fig. 1.
Fig. 1. (a) Schematic view of X-ray scattering. The wavevectors of the incident and scattered X-rays are $k→i$ and $k→f$, respectively. In most cases, elastic scattering occurs while keeping the magnitude of the scattering wavevector equal to that of the incidence wave vector, as shown in the inset figure. Momentum transfer of X-rays is defined as $Q→$ = $k→f$$k→i$ , and if two wavevectors exist in the x-z plane (scattering plane), $Q→$ = $2k→z$. Actually, $Q→$ is the wavevector transfer since the momentum of photon is defined as $ℏk→$, however we can ignore the constant $ℏ$ and consider the wavevector transfer as the momentum transfer (as a physical quantity). (b) Scattering angle related to correlated lengths of scatterers such as nano-structures and atomic structures.
Applied Science and Convergence Technology 2022;31:128~132 https://doi.org/10.5757/ASCT.2022.31.6.128