Diffraction
various phenomena that occur when a wave encounters an obstacle or a slit
various phenomena that occur when a wave encounters an obstacle or a slit  Padrão de difração e interferência na fenda dupla. | |||||
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English: Diffraction
Dansk: Bøjning
Deutsch: Beugung
Français : Diffraction
Suomi: Diffraktio
Español: Difracción
Nederlands: Diffractie
Русский: Дифракция
Drawings
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Diffraction disc from a circular aperture -
Diffraction vector: difference between the wave vector of the scattered wave and the incident wave -
Structure factor: interferences of waves scattered by the atoms inside the cell -
Shape factor: interferences of waves scattered by the different cells -
When the diffraction vector K stays on the same direction, this means that wave vectors of the incidence and scattered waves move symetrically -
On a single crystal, there is diffraction when the diffraction vector K meet the reciprocal lattice -
On a powder, there is diffraction when the diffraction vector K meet the sphere formed by the node of all the reciprocal lattice -
When the incidence wave vector is fixed, the possible diffraction vectors form a sphere called the Ewald sphere or reflection sphere -
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 -
Limiting sphere: obtained by the rotation around the origin of the refelction(Ewald) sphere -
Rotation of the Ewald sphere and Bragg-Brentano geometry (direction of the diffraction vector fixed) -
Drawing explaining the principle behind two-slit diffraction. -
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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Photographs
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Spectrum from a mercury streetlight diffracted through a compact disc. -
Diffraction pattern seen in a spiderweb -
Diffraction angles of a red laser at 600 lines per mm -
Diffraction waves at ocean surface -
Diffraction at breakwater -
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