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Physics
Atomic and Condensed Matter
Why X-ray scattering in crystalline solids is elastic?
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[QUOTE="hutchphd, post: 6558878, member: 635497"] This is a confusing but important point. Any change in momentum by ## \vec K ## (a reciprocal lattice vector) involves resonant scattering [B]by the entire sample. [/B]The entire crystal absorbs the recoil energy and momentum and it is effectively an elastic process. So photon energy is effectively conserved although the actual momentum can change by ## \vec K ## (this is sometimes called "conservation of crystal momentum" as stated just involves coherent elastic scattering by the entire lattice which has a very very large mass). The fact that the lattice is not completely rigid does show up in the scattering but mostly to make the diffraction very slightly fuzzy. [/QUOTE]
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Physics
Atomic and Condensed Matter
Why X-ray scattering in crystalline solids is elastic?
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