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Related Concept Videos

X-ray Crystallography02:18

X-ray Crystallography

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...
X-ray Diffraction of Biological Samples01:10

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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 crystal...
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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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Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples
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Angular calibration in energy dispersive X-Ray diffraction by using genetic algorithms.

A Brunetti1, V Rossi Albertini, D Bailo

  • 1Struttura Dipartimentale di Matematica e Fisica, Università di Sassari, 07100, Sassari, Italy. brunetti@uniss.it

Journal of X-Ray Science and Technology
|November 7, 2009
PubMed
Summary
This summary is machine-generated.

A new genetic algorithm method accurately corrects errors in Energy Dispersive X-Ray Diffraction (EDXRD) measurements. This automated approach ensures reliable momentum transfer (q) values for crystalline and non-crystalline samples.

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Area of Science:

  • Materials Science
  • Crystallography
  • Analytical Chemistry

Background:

  • Accurate estimation of momentum transfer (q) is crucial in Energy Dispersive X-Ray Diffraction (EDXRD) for analyzing material structures.
  • Uncertainties in geometric setup, sample positioning, and collimation can lead to significant errors in q-value determination.

Purpose of the Study:

  • To develop and present a novel, automated self-calibration method for correcting geometric errors in EDXRD measurements.
  • To improve the accuracy and reliability of momentum transfer (q) values derived from EDXRD data.

Main Methods:

  • Implementation of a genetic algorithm for self-calibration of EDXRD geometric parameters.
  • Application of the method to reference samples for validation.
  • Analysis of diffraction patterns from both crystalline (Bragg peaks) and non-crystalline (diffused bumps) materials.

Main Results:

  • The genetic algorithm method provides a fast and robust correction for angular uncertainties in EDXRD.
  • It accurately estimates key parameters like effective starting angle and angular step for multi-angle data collection.
  • Reliable q-values were obtained for diffraction features, enhancing data interpretation.

Conclusions:

  • The presented genetic algorithm offers an efficient and automatic solution for geometric error correction in EDXRD.
  • This method significantly improves the accuracy of q-value determination, benefiting the analysis of both crystalline and non-crystalline materials.
  • The approach facilitates faster and more reliable structural analysis using EDXRD techniques.