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A single crystal, linearly polarized Fe 2p X-ray absorption study of gillespite

Published online by Cambridge University Press:  05 July 2018

P. F. Schofield ,
G. van der Laan ,
C. M. B. Henderson  and
G. Cressey
P. F. Schofield
Affiliation:
Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK
G. van der Laan
Affiliation:
Synchrotron Radiation Department, Daresbury Laboratory, Warrington WA4 4AD, UK
C. M. B. Henderson
Affiliation:
Synchrotron Radiation Department, Daresbury Laboratory, Warrington WA4 4AD, UK Department of Earth Science, University of Manchester, Manchester M13 9PL, UK
G. Cressey
Affiliation:
Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK
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Abstract

The Fe 2p X-ray absorption spectra of single crystal gillespite, BaFeSi4O10, show a strong linear dichroism, i.e. a large difference in the absorption when measured with the polarization of the X-rays either parallel or perpendicular to the plane of the FeO4 group. The isotropic spectrum, obtained from measurement at the ‘magic angle’, and the polarization dependent spectra have been compared to atomic multiplet calculations and show an excellent agreement with theory. Analysis of the branching ratio, the linear dichroism, and the detailed peak structure confirms that the 5A1 level is the ground state at room temperature and pressure. The 5B2 level is sufficiently low in energy that a distortion of the electronic charge density, induced by increased pressure, may result in a 5B2 ground state.

Keywords

gillespiteX-ray absorption spectroscopylinear dichroism
Type
Research Article
Information
Mineralogical Magazine , Volume 62 , Issue 1 , February 1998 , pp. 65 - 75
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1998

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