TETRAHEDRAL ANISOTROPY OF X-RAY ANOMALOUS SCATTERING

被引：93

作者：

TEMPLETON, DH

TEMPLETON, LK

机构：

[1] Department of Chemistry, University of California, Berkeley

来源：

PHYSICAL REVIEW B | 1994年 / 49卷 / 21期

关键词：

D O I：

10.1103/PhysRevB.49.14850

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 K edge and 7 eV above the Ge K edge large changes of intensities with rotation of azimuth are observed for weak and forbidden Bragg reflections in agreement with the optical model.

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页码：14850 / 14853

页数：4

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