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Combining a multi-analyzer stage with a two-dimensional detector for high-resolution powder X-ray diffraction:

Andrew Fitch1, Catherine Dejoie1

  • 1ESRF, 71 Avenue des Martyrs, CS40220, 38043 Grenoble Cedex 9, France.

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|August 25, 2021
PubMed
Summary
This summary is machine-generated.

A new 2D pixel detector on the ID22 beamline improves powder diffraction analysis. It corrects apparent diffraction angles, reducing peak asymmetry and narrowing peaks for better data resolution.

Keywords:
analyzer crystalsaxial divergencehigh-resolution powder X-ray diffractiontwo-dimensional detectors

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Area of Science:

  • Materials Science
  • Crystallography
  • X-ray Diffraction

Background:

  • High-resolution powder diffraction experiments utilize multi-analyzer stages to detect diffracted intensity.
  • Traditional methods with scintillation counters have limitations in angular resolution and peak shape analysis.

Purpose of the Study:

  • To introduce and evaluate a two-dimensional pixel detector for powder diffraction.
  • To demonstrate the detector's capability in correcting diffraction angles and improving peak characteristics.

Main Methods:

  • A two-dimensional pixel detector was mounted on the nine-channel multi-analyzer stage of the ID22 beamline.
  • Diffracted intensity was recorded as 2D images at various diffractometer arm angles (2Θ).
  • Regions of interest on the detector were used to extract diffracted intensity and analyze axial positions.

Main Results:

  • The pixel detector enables correction of apparent diffraction angles (2Θ) to true diffraction angles (2θ) using axial resolution.
  • This correction reduces low-angle peak asymmetry and results in narrower peaks compared to uncorrected data.
  • Optimizing axial acceptance with diffraction angle allows for enhanced angular resolution and counting statistics.

Conclusions:

  • The implemented 2D pixel detector significantly enhances powder diffraction data quality.
  • Axial resolution provides a method for correcting diffraction angles, leading to improved peak shapes and data interpretation.
  • The system offers flexibility in optimizing resolution and counting statistics across different diffraction angles.