Premium
Polarized X‐ray absorption. Evidence of orientational dispersion in hornblende minerals
Author(s) -
Lippmann T.,
Fischer K.,
Kirfel A.
Publication year - 1998
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889897008790
Subject(s) - absorption edge , anisotropy , absorption (acoustics) , amphibole , tensor (intrinsic definition) , dispersion (optics) , hornblende , chemistry , molecular physics , condensed matter physics , optics , materials science , physics , band gap , quartz , mathematics , biotite , pure mathematics , composite material
The first experimental evidence for orientational dispersion of an absorption tensor in the X‐ray regime is presented. For two amphibole minerals, edenite and hastingsite, the X‐ray absorption tensors were determined at the Fe K edge by means of polarized fluorescence spectroscopy. Analysis of the energy‐dependent tensor elements revealed anisotropic anomalous scattering and, in analogy to visible light optics, energy dependence of the respective absorption tensor orientations. Hence, the experiments provide further evidence for the optical model developed earlier describing the polarized near‐edge absorption.