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  2. X-ray crystallography - Wikipedia

    en.wikipedia.org/wiki/X-ray_crystallography

    A powder X-ray diffractometer in motion. X-ray crystallography is the experimental science of determining the atomic and molecular structure of a crystal, in which the crystalline structure causes a beam of incident X-rays to diffract in specific directions.

  3. Law of constancy of interfacial angles - Wikipedia

    en.wikipedia.org/wiki/Law_of_constancy_of...

    The contact goniometer was the first instrument used to measure the interfacial angles of crystals. The International Union of Crystallography (IUCr) gives the following definition: "The law of the constancy of interfacial angles (or 'first law of crystallography') states that the angles between the crystal faces of a given species are constant, whatever the lateral extension of these faces ...

  4. Wyckoff positions - Wikipedia

    en.wikipedia.org/wiki/Wyckoff_positions

    The Wyckoff positions are named after Ralph Wyckoff, an American X-ray crystallographer who authored several books in the field.His 1922 book, The Analytical Expression of the Results of the Theory of Space Groups, [3] contained tables with the positional coordinates, both general and special, permitted by the symmetry elements.

  5. Bragg's law - Wikipedia

    en.wikipedia.org/wiki/Bragg's_law

    The measurement of the angles can be used to determine crystal structure, see x-ray crystallography for more details. [5] [13] As a simple example, Bragg's law, as stated above, can be used to obtain the lattice spacing of a particular cubic system through the following relation:

  6. Miller index - Wikipedia

    en.wikipedia.org/wiki/Miller_index

    Miller indices are also used to designate reflections in X-ray crystallography. In this case the integers are not necessarily in lowest terms, and can be thought of as corresponding to planes spaced such that the reflections from adjacent planes would have a phase difference of exactly one wavelength (2 π ), regardless of whether there are ...

  7. Category:X-ray crystallography - Wikipedia

    en.wikipedia.org/wiki/Category:X-ray_crystallography

    Download as PDF; Printable version; In other projects Wikimedia Commons; ... X-ray crystallography; X-ray diffraction; A. Anomalous X-ray scattering; B. Bernal chart;

  8. Molecular replacement - Wikipedia

    en.wikipedia.org/wiki/Molecular_replacement

    Molecular replacement (MR) [1] is a method of solving the phase problem in X-ray crystallography.MR relies upon the existence of a previously solved protein structure which is similar to our unknown structure from which the diffraction data is derived.

  9. Crystallography - Wikipedia

    en.wikipedia.org/wiki/Crystallography

    Crystallography is a broad topic, and many of its subareas, such as X-ray crystallography, are themselves important scientific topics. Crystallography ranges from the fundamentals of crystal structure to the mathematics of crystal geometry, including those that are not periodic or quasicrystals.