Tetrahedral anisotropy of x-ray anomalous scattering

Journal Article · Wed Jun 01 04:00:00 EDT 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.49.14850· OSTI ID:7274108

Templeton, D H; Templeton, L K ^[1]

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1. Department of Chemistry, University of California, Berkeley, California 94720 (United States)

Diffraction of synchrotron radiation in crystals of potassium chromate and germanium reveals a tetrahedral anisotropy of anomalous (resonant) scattering with respect to polarization and wave vectors that introduces a third-rank tensor into the intensity equations. This tensor arises from a mixed dipole-quadrupole term that vanishes for forward scattering and for centrosymmetric atoms. At resonances 13 eV below the Cr [ital K] edge and 7 eV above the Ge [ital K] edge large changes of intensities with rotation of azimuth are observed for weak and forbidden Bragg reflections in agreement with the optical model.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 7274108
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 49:21; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360602* -- Other Materials-- Structure & Phase Studies
ALKALI METAL COMPOUNDS
ANISOTROPY
BRAGG REFLECTION
BREMSSTRAHLUNG
CHROMATES
CHROMIUM COMPOUNDS
ELECTROMAGNETIC RADIATION
ELEMENTS
GERMANIUM
METALS
OXYGEN COMPOUNDS
POLARIZATION
POTASSIUM COMPOUNDS
RADIATIONS
REFLECTION
STRUCTURAL CHEMICAL ANALYSIS
SYNCHROTRON RADIATION
TRANSITION ELEMENT COMPOUNDS