Fiber diffraction

$Ideal fiber diffraction pattern of a semi-crystalline material with amorphous halo and reflexions on layer lines. High intensity is represented by dark color. The fiber axis is vertical$

$Fiber diffraction geometry changes as the fiber is tilted (tilt-angle β is between the blue rigid axis and the axis labelled s-space). Structure information is in reciprocal space (black axes), expanded on surfaces of Polanyi spheres. In the animation 1 Polanyi sphere with 1 reflection on it is monitored$

Fiber pattern of polypropylene mapped into (the representative plane of) reciprocal space

Fiber diffraction is a subarea of scattering, an area in which molecular structure is determined from scattering data (usually of X-rays, electrons or neutrons). In fiber diffraction the scattering pattern does not change, as the sample is rotated about a unique axis (the fiber axis). Such uniaxial symmetry is frequent with filaments or fibers consisting of biological or man-made macromolecules. In crystallography fiber symmetry is an aggravation regarding the determination of crystal structure, because reflexions are smeared and may overlap in the fiber diffraction pattern. Materials science considers fiber symmetry a simplification, because almost the complete obtainable structure information is in a single two-dimensional (2D) diffraction pattern exposed on photographic film or on a 2D detector. 2 instead of 3 co-ordinate directions suffice to describe fiber diffraction.

单词	Fiber diffraction
释义	Fiber diffraction 英语百科 Fiber diffraction $Ideal fiber diffraction pattern of a semi-crystalline material with amorphous halo and reflexions on layer lines. High intensity is represented by dark color. The fiber axis is vertical$ $Fiber diffraction geometry changes as the fiber is tilted (tilt-angle β is between the blue rigid axis and the axis labelled s-space). Structure information is in reciprocal space (black axes), expanded on surfaces of Polanyi spheres. In the animation 1 Polanyi sphere with 1 reflection on it is monitored$ Fiber diffraction is a subarea of scattering, an area in which molecular structure is determined from scattering data (usually of X-rays, electrons or neutrons). In fiber diffraction the scattering pattern does not change, as the sample is rotated about a unique axis (the fiber axis). Such uniaxial symmetry is frequent with filaments or fibers consisting of biological or man-made macromolecules. In crystallography fiber symmetry is an aggravation regarding the determination of crystal structure, because reflexions are smeared and may overlap in the fiber diffraction pattern. Materials science considers fiber symmetry a simplification, because almost the complete obtainable structure information is in a single two-dimensional (2D) diffraction pattern exposed on photographic film or on a 2D detector. 2 instead of 3 co-ordinate directions suffice to describe fiber diffraction.
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