Significance tests on the crystallographic R factor
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This article is published in Acta Crystallographica.The article was published on 1965-03-01 and is currently open access. It has received 1816 citations till now.read more
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Free R value: a novel statistical quantity for assessing the accuracy of crystal structures.
TL;DR: In this article, a statistical quantity (RfreeT) is defined to measure the agreement between observed and computed structure factor amplitudes for a 'test' set of reflections that is omitted in the modelling and refinement process.
Journal ArticleDOI
Comparison of silver and molybdenum microfocus X-ray sources for single-crystal structure determination
TL;DR: A detailed comparison of single-crystal diffraction data collected with Ag Kα and Mo’™Kα microsources (IµS) indicates that the Ag”Kα data are better when absorption is significant.
Journal ArticleDOI
Crystal Structure and Hydrogen-Bonding System in Cellulose Iβ from Synchrotron X-ray and Neutron Fiber Diffraction
TL;DR: In this article, the crystal and molecular structure of cellulose Iβ were determined using synchrotron and neutron diffraction data recorded from oriented fibrous samples prepared by aligning cellulose microcrystals from tunicin.
Journal ArticleDOI
Ruddlesden-Popper Hybrid Lead Iodide Perovskite 2D Homologous Semiconductors
Constantinos C. Stoumpos,Duyen H. Cao,Daniel J. Clark,Joshua Young,Joshua Young,James M. Rondinelli,Joon I. Jang,Joseph T. Hupp,Mercouri G. Kanatzidis +8 more
TL;DR: In this paper, a large scale synthesis, crystal structure, and optical characterization of the 2D (CH3(CH2)3NH3)n−1PbnI3n+1 (n = 1, 2, 3, 4, ∞) perovskites is presented.
Journal ArticleDOI
Absolute structure and absolute configuration.
H. D. Flack,Gérald Bernardinelli +1 more
TL;DR: Important experimental and algorithmic details of the current methods used for absolute-structure determination are provided and attention is given to the analysis of absolute structure and absolute configuration in twinned crystals.
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