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Related Concept Videos

Determination of Crystal Structures01:29

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In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
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The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
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X-ray diffraction or XRD is an analytical tool that utilizes X-rays to study ordered structures such as crystalline organic and inorganic samples, polycrystalline materials, proteins, carbohydrates, and drugs.
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Related Experiment Video

Updated: Apr 25, 2026

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
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Diffraction by nanocrystals II.

Joe P J Chen, Rick P Millane

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
    |August 15, 2014
    PubMed
    Summary
    This summary is machine-generated.

    Nanocrystals with multiple molecules per unit cell often show surface defects. This study simplifies interpreting their X-ray diffraction patterns by minimizing surface-related signals.

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    Area of Science:

    • Materials Science
    • Crystallography
    • Condensed Matter Physics

    Background:

    • Nanocrystals with multiple molecules per unit cell typically exhibit incomplete unit cells on their surfaces.
    • Ensemble-averaged diffraction from these nanocrystals includes standard Bragg peaks and additional Bragg-like components attributed to surface incompleteness.

    Purpose of the Study:

    • To develop a method for simplifying the interpretation of X-ray diffraction patterns from nanocrystals with incomplete surface unit cells.
    • To minimize the contribution of surface-related diffraction components for clearer analysis.

    Main Methods:

    • Formulation of the diffraction problem by leveraging the inherent flexibility in defining the incomplete-unit-cell surface region.
    • Computational simulations to analyze diffraction patterns in reciprocal space and assess the impact of crystal faceting.

    Main Results:

    • A method was developed to minimize the magnitude of Bragg-like components arising from incomplete unit cells.
    • Simulations demonstrated the behavior of relative diffraction component magnitudes across different reciprocal space regions.
    • The influence of crystal faceting on the diffraction profile was investigated.

    Conclusions:

    • Minimizing surface-related diffraction components offers a simpler and more practical interpretation of nanocrystal diffraction data.
    • The findings provide insights into the relationship between surface structure, crystal faceting, and diffraction characteristics.