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Related Concept Videos

X-ray Crystallography02:18

X-ray Crystallography

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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.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
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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.
According to Bragg's law, when X-rays strike the sample positioned on a stage, the rays are  scattered by the electron clouds around the sample atoms. The  X-ray diffraction or scattering is caused by constructive interference of the X-ray waves that reflect off the internal...
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Related Experiment Video

Updated: Dec 11, 2025

Neutron Crystallography Data Collection and Processing for Modelling Hydrogen Atoms in Protein Structures
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Neutron Crystallography Data Collection and Processing for Modelling Hydrogen Atoms in Protein Structures

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TAAM: a reliable and user friendly tool for hydrogen-atom location using routine X-ray diffraction data.

Kunal Kumar Jha1, Barbara Gruza1, Prashant Kumar1

  • 1Biological and Chemical Research Centre, Department of Chemistry, University of Warsaw, ul. Żwirki i Wigury 101, Warszawa, 02-089, Poland.

Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
|August 25, 2020
PubMed
Summary
This summary is machine-generated.

Accurate hydrogen atom positions in crystals can now be determined using X-ray diffraction with the Transferable Aspherical Atom Model (TAAM), improving precision over the Independent Atom Model (IAM). This method offers results comparable to neutron diffraction, making it more accessible.

Keywords:
DiSCaMBHARIAMTAAMaspherical scattering factorsquantum crystallographystructure refinement

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Area of Science:

  • Crystallography
  • Materials Science
  • Chemistry

Background:

  • Hydrogen is a fundamental element in biological molecules, crucial for chemical bonding and reactivity.
  • X-ray diffraction is a primary technique for crystal structure determination, but hydrogen's low electron density poses detection challenges.
  • Neutron diffraction accurately determines hydrogen positions but is limited by resource-intensive requirements and facility availability.

Purpose of the Study:

  • To investigate the efficacy of the Transferable Aspherical Atom Model (TAAM) as an alternative to the Independent Atom Model (IAM) for hydrogen atom localization using X-ray diffraction data.
  • To enhance the precision and accuracy of X-H bond length determination from routine X-ray crystallography.
  • To provide a more accessible method for obtaining hydrogen bond length data comparable to neutron diffraction results.

Main Methods:

  • Utilized the Transferable Aspherical Atom Model (TAAM), derived from a pseudoatom databank, for structure refinement.
  • Applied TAAM parametrizations from the modified University of Buffalo Databank (UBDB) via the DiSCaMB software library.
  • Refined 75 datasets of organic molecule crystals using X-ray diffraction data, including data of atomic resolution (dmin ≤ 0.83 Å).

Main Results:

  • TAAM refinements with X-ray data yielded X-H bond lengths comparable to averaged neutron diffraction bond lengths, often within one standard deviation.
  • Atomic displacements determined by TAAM systematically differed from those obtained using the Independent Atom Model (IAM).
  • TAAM demonstrated improved fitting of experimental data at standard resolutions compared to IAM, alongside the development of user-friendly software.

Conclusions:

  • The Transferable Aspherical Atom Model (TAAM) offers a viable and accurate alternative to neutron diffraction for determining hydrogen atom positions and X-H bond lengths using X-ray diffraction.
  • TAAM significantly enhances the precision and accuracy of X-H bond lengths derived from routine X-ray crystallography, making high-quality structural data more accessible.
  • The developed software facilitates the routine application of aspherical atom models in organic molecule crystallography, comparable in speed to spherical atom models.