Diffraction
[edit] Drawings
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Diffraction disc from a circular aperture
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Diffraction vector: difference between the wave vector of the scattered wave and the incident wave
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Structure factor: interferences of waves scattered by the atoms inside the cell
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Shape factor: interferences of waves scattered by the different cells
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When the diffraction vector K stays on the same direction, this means that wave vectors of the the incidence and scattered waves move symetrically
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On a single crystal, there is diffraction when the diffraction vector K meet the reciprocal lattice
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On a powder, there is diffraction when the diffraction vector K meet the sphere formed by the node of all the reciprocal lattice
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When the incidence wave vector is fixed, the possible diffraction vectors form a sphere called the Ewald sphere or reflection sphere
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The intersection of the sphere of the nodes of the reciprocal lattice and the Ewald sphere show that the wave vector of the diffused wave whene there is diffraction form a cone
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Limiting sphere: obtained by the rotation around the origin of the refelction(Ewald) sphere
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Rotation of the Ewald sphere and Bragg-Brentano geometry (direction of the diffraction vector fixed)
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Drawing explaining the principle behind two-slit diffraction.
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Bragg diffraction from a cubic lattice
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Illustration of two-slit diffraction, based on a sketch by Thomas Young
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[edit] Photographs
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Spectrum from a mercury streetlight diffracted through a compact disc.
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Diffraction pattern seen in a spiderweb
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Diffraction angles of a red laser at 600 lines per mm
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Diffraction waves at ocean surface
