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Anisotropy in Borrmann spectroscopy

DOI: 10.1140/epjst/e2012-01608-1 DOI Help

Authors: S. P. Collins (Diamond Light Source) , M. Tolkiehn (Deutsches Elektronensynchrotron DESY, Germany) , T. Laurus (Deutsches Elektronensynchrotron DESY, Germany) , V. E. Dmitrienko (A. V. Shubnikov Institute of Crystallography, Russia)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: The European Physical Journal Special Topics , VOL 208 (1) , PAGES 75 - 87

State: Published (Approved)
Published: June 2012

Abstract: In this paper we introduce Borrmann Spectroscopy as a method for measuring X-ray absorption spectra under conditions of an exotic wave field, namely, a coherent superposition of two plane waves. The essential features of the Borrmann Effect (also known as anomalous transmission) are outlined. We show that the Borrmann Effect can lead to a very strong relative enhancement of quadrupole absorption. After describing some early results in this field, and some general considerations of multiple-wave absorption, we contrast recent results on anisotropy in Borrmann spectroscopy with normal absorption. Despite the qualitative success of a simple model for quadrupole enhancement, temperature dependence and anisotropy, a general theory of the Borrmann Effect is required which includes anisotropic and non-dipolar scattering. We outline some first steps towards such a theory.

Journal Keywords: Absorption Spectra; Gadolinium; X-Ray Diffraction; X-Ray Spectroscopy

Subject Areas: Physics

Instruments: I16-Materials and Magnetism

Other Facilities: ESRF