Difference between revisions of "XCCA"

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(Reconstruction)
(See Also)
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** [[Ring graininess]] analysis (to determine grain count, grain size and size-distribution, crystallinity, etc.)
 
** [[Ring graininess]] analysis (to determine grain count, grain size and size-distribution, crystallinity, etc.)
 
*** [[Yager, K.G.]]; Majewski, P.W. [http://scripts.iucr.org/cgi-bin/paper?S1600576714020822 Metrics of graininess: robust quantification of grain count from the non-uniformity of scattering rings] ''Journal of Applied Crystallography'' '''2014''', 47, 1855–1865. [http://dx.doi.org/10.1107/S1600576714020822 doi: 10.1107/S1600576714020822]
 
*** [[Yager, K.G.]]; Majewski, P.W. [http://scripts.iucr.org/cgi-bin/paper?S1600576714020822 Metrics of graininess: robust quantification of grain count from the non-uniformity of scattering rings] ''Journal of Applied Crystallography'' '''2014''', 47, 1855–1865. [http://dx.doi.org/10.1107/S1600576714020822 doi: 10.1107/S1600576714020822]
 +
** Heterogeneity
 +
*** C. J. Gommes [http://scripts.iucr.org/cgi-bin/paper?ge5024 Small-angle scattering and scale-dependent heterogeneity] ''J. Appl. Cryst.'' '''2016''', 49, 1162-1176. [https://doi.org/10.1107/S1600576716007810 doi: 10.1107/S1600576716007810]

Revision as of 21:08, 11 November 2016

X-ray cross-correlation analysis (XCCA) is a suite of techniques for analyzing correlations within x-ray scattering datasets. In particular, analysis of angular correlations within the 2D detector image can be used to isolate structural information that would be lost in a conventional circular-averaged 1D curve. Thus, even for nominally isotropic materials (powder-like sample), information about local symmetry (and thus packing motifs or unit cell) can be extracted from the data.

Angular correlation information can also be mined to reconstruct the three-dimensional reciprocal-space from individual 2D detector snapshots. That is, XCCA methods can be exploited to co-align scattering frames, registering them into the 3D scattering volume. This is conceptually similar to reciprocal-space mapping, but instead of directly reconstructing reciprocal-space by merging images, this is done in a statistical sense (because the relative alignment of frames is not known).

References

XCCA

Reconstruction

Sparse Data

XFEL

See Also