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Generalized extinction in bipyramidal crystals.

Thorkildsen G1, Larsen HB, Semmingsen D

  • 1Department of Mathematics and Natural Science, Stavanger University College, Ullandhaug, N-4091 Stavanger, Norway. gunnar.thorkildsen@tn.his.no

Acta Crystallographica. Section A, Foundations of Crystallography
|February 27, 2001
PubMed
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Researchers indirectly measured generalized extinction factors as a function of wavelength in perfect crystals. Experimental results closely matched theoretical predictions with increased crystal perfection, validating the measurement technique.

Area of Science:

  • Crystallography
  • Materials Science
  • Solid-State Physics

Background:

  • Generalized extinction factors are crucial for accurate crystallographic analysis.
  • Theoretical models for finite perfect crystals require specific geometrical conditions.
  • Indirect measurement techniques are needed for non-measurable factors.

Purpose of the Study:

  • To experimentally determine generalized extinction factors as a function of wavelength.
  • To validate theoretical models for finite perfect crystals.
  • To develop a reliable indirect measurement procedure.

Main Methods:

  • Indirect measurement of generalized extinction factors using strong reflections.
  • Experiments conducted on crystalline systems meeting theoretical geometrical requirements.

Related Experiment Videos

  • Utilizing integrated diffracted power of weak reflections for scaling strong reflections.

    • Main Results:

    • Experimental results approached theoretical predictions with increased crystal perfection.
    • Reduced mosaic distribution width from three to one thousandth of a degree correlated with improved accuracy.
    • Elimination of non-measurable wavelength-dependent factors through the scaling procedure.

    Conclusions:

    • The indirect measurement procedure accurately determines generalized extinction factors.
    • Experimental validation of theoretical models for finite perfect crystals was achieved.
    • Increased crystal perfection significantly improves the accuracy of extinction factor measurements.