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Related Experiment Videos

Response to Fraser & Wark's comments on A new theory for X-ray diffraction.

Paul F Fewster1

  • 1Brighton, UK.

Acta Crystallographica. Section A, Foundations and Advances
|September 6, 2018
PubMed
Summary

This study refines crystal diffraction theory by introducing a "thick" Ewald sphere, explaining persistent intensity outside the Bragg condition. This new perspective addresses criticisms and offers a more complete interpretation of diffraction patterns.

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Area of Science:

  • Crystallography
  • Materials Science
  • Physics

Background:

  • Conventional diffraction theory assumes an infinitely thin Ewald sphere surface.
  • Previous criticisms of a new theory stem from a misunderstanding of its core concepts.
  • Crystal shape effects are distinct from the predicted diffraction phenomenon.

Purpose of the Study:

  • To clarify a new theory of crystal diffraction, addressing prior criticisms.
  • To demonstrate the theory's relationship with the Ewald sphere construction.
  • To present experimental evidence supporting the new diffraction model.

Main Methods:

  • Re-evaluation of diffraction theory based on the Ewald sphere construction.
  • Detailed explanation of diffraction pattern formation from stacked planes.
Keywords:
diffraction theorypowder diffractionsmall crystals

Related Experiment Videos

  • Experimental validation of predicted persistent intensity outside the Bragg condition.

    • Main Results:

    • The new theory models the Ewald sphere surface as having a finite thickness.
    • Persistent intensity is predicted and observed outside the Bragg condition (approx. 10^-5).
    • The analysis highlights the incompleteness of previous interpretations of diffraction patterns.

    Conclusions:

    • The proposed theory offers a more complete interpretation of diffraction patterns than conventional models.
    • The concept of a "thick" Ewald sphere surface is experimentally verifiable.
    • Understanding this persistent intensity is crucial for accurate diffraction analysis.