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Forthcoming article in Acta Crystallographica Section A Foundations and Advances



Acta Crystallographica Section A: Foundations and Advances covers theoretical and fundamental aspects of the structure of matter. The journal is the prime forum for research in diffraction physics and the theory of crystallographic structure determination



 



X-ray Laue asymmetrical case plane wave rocking curves depending on deviation from exact Bragg orientation in diffraction plane and in perpendicular to diffraction plane direction
For asymmetrical Laue case the X-ray rocking curves depending on deviation angles from the exact Bragg orientation in the diffraction plane and in the direction perpendicular to the diffraction plane are investigated.






Monoclinic sphere packings. II. Trivariant lattice complexes with mirror symmetry
All homogeneous sphere packings were derived that refer to the trivariant monoclinic lattice complexes with mirror symmetry.



Coordination numbers of the vertex graph of a Penrose tiling
A description of the coordination sequence of the vertex graph of a Penrose tiling is obtained.






The development of powder profile refinement at the Reactor Centre Netherlands at Petten
Around 1965 at the Reactor Centre Netherlands at Petten, Loopstra, van Laar and Rietveld developed `profile refinement'. Although Loopstra had the idea, van Laar worked it out mathematically and Rietveld wrote the computer program, the essential contributions of the first two are forgotten when using `Rietveld refinement'.



Electron-density critical points analysis and catastrophe theory to forecast structure instability in periodic solids
Electron-density topology is used to detect instability in periodic solids.



The fundamentals of crystal orientation
New parametric equations are developed for crystal orientation, the solutions of which are free of constraints or approximations and are well suited for determination of crystal orientation with high accuracy and precision. These equations are validated and checked for orienting of single crystals with high precision and accuracy.