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  2. Rietveld refinement - Wikipedia

    en.wikipedia.org/wiki/Rietveld_refinement

    The pseudo-Voigt function, like the Gaussian and Lorentz functions, is a centrosymmetric function, and as such does not model asymmetry. This can be problematic for non-ideal powder XRD data, such as those collected at synchrotron radiation sources, which generally exhibit asymmetry due to the use of multiple focusing optics.

  3. 12 Risky Mistakes to Avoid When Shopping on Craigslist and ...

    www.aol.com/12-risky-mistakes-avoid-shopping...

    Don't use your real email or phone number when you place an ad on Craigslist, and definitely don't click any links or give your credit card number to anyone. martin-dm/istockphoto 2.

  4. List of molecular graphics systems - Wikipedia

    en.wikipedia.org/wiki/List_of_molecular_graphics...

    MM XRD MD: Free open-source, GPL C++, Qt, extensible via Python modules BALL: Molecular dynamics MM NMR: LGPL open-source: Standalone program [7] Cn3D: Free open-source: Standalone program [8] In the NCBI C++ toolkit Coot: XRD: Free open-source: Gabedit: XRD MM: Free open-source: C [9] Jmol: Free open-source: Java (applet or standalone program ...

  5. Powder diffraction - Wikipedia

    en.wikipedia.org/wiki/Powder_diffraction

    Laboratory X-ray diffraction equipment relies on the use of an X-ray tube, which is used to produce the X-rays. The most commonly used laboratory X-ray tube uses a copper anode, but cobalt and molybdenum are also popular. The wavelength in nm varies for each source. The table below shows these wavelengths, determined by Bearden [14] (all values ...

  6. X-ray spectroscopy - Wikipedia

    en.wikipedia.org/wiki/X-ray_spectroscopy

    Working with a power limit of 30 watts was very challenging, and a device was delivered but it wasn’t used. Later NASA developments did lead to an X-ray spectrographic unit that did make the desired moon soil analysis. The Norelco efforts faded but the use of X-ray spectroscopy in units known as XRF instruments continued to grow.

  7. Three-dimensional X-ray diffraction - Wikipedia

    en.wikipedia.org/wiki/Three-dimensional_X-ray...

    To determine the crystallographic orientation of the grains in the considered sample, the following software packages are in use: Fable [8] and GrainSpotter. [9] Reconstructing the 3D shape of the grains is nontrivial and three approaches are available to do so, respectively based on simple back-projection, forward projection, algebraic ...

  8. XRD - Wikipedia

    en.wikipedia.org/wiki/XRD

    XRD may refer to: X-ray diffraction , used to study the structure, composition, and physical properties of materials Extensible Resource Descriptor , an XML format for discovery of metadata about a web resource

  9. Le Bail method - Wikipedia

    en.wikipedia.org/wiki/Le_Bail_method

    Some authors suggest the Le Bail technique exploits prior information more efficiently than Pawley method. This was an important consideration at the time of development when computing power was limited. Le Bail is also easily integrated into Rietveld analysis software, and is a part of a number of programs. Both methods improve subsequent ...

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