Correlation between diffraction and inelastic scattering of X-rays in crystals

X-ray thermal diffuse scattering (TDS) as well as Compton scattering in crystal yields diffraction pattern similar to Kikuchi-pattern in electron diffraction. Fluorescent X-rays yield Kossel-pattern. Intensity of inelastic scattering from a nearly perfect crystal varies when glancing angle of the incident beam varies across the Bragg angle. The above two phenomena are considered to be in relation of reciprocal processes. The diffraction pattern depends upon crystal perfection, wavelength and crystal thickness. A review on these theoretical and experimental studies using X-rays from a sealed-off tube and monochromatized synchrotron radiation will be given for correlation between TDS and Bragg reflections in mosaic crystals and a nearly perfect germanium crystal. Recoilless [γ]-raycalled M[ö]ssbauer [γ]-rayare emitted from radioactive isotopes called M[ö]ssbauer isotopes. The [γ]-ray excite Bragg reflection and show diffraction phenomena. The experimental studies related to correlation between [γ]-raydiffraction and inelastic scattering using recoilless [γ]-rayare reported. The experimental technique is applied to nuclear resonance filtering, on which research and development are now progressing.