Applied Physics A

, Volume 37, Issue 1, pp 57–64 | Cite as

Direct determination of X-Ray reflection phases for noncentrosymmetric crystals

  • S. -L. Chang
  • J. A. Prado Valladares
Contributed Papers

Abstract

An experimental method is described for the phase determination of x-ray reflections from noncentrosymmetric crystals. This method results from considerations on the phase dependence of line profiles in three-beam reflection-type diffractions for wavelength λ above and below a critical absorption edgeλ E of the heaviest constituent atom in the crystals. A relationS p =S L ·S R for phase determination is derived theoretically and verified experimentally forλ<λ E ,S p being the sign of the sine of invariant phase,S L the sign defined from the line profile, andS R determined by the rotation of the crystal lattice.

PACS

61.10 

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Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • S. -L. Chang
    • 1
  • J. A. Prado Valladares
    • 1
  1. 1.Instituto de FísicaUniversidade Estadual de CampinasCampinas-SPBrasil

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