A Single Crystal, Linearly Polarized Fe 2p X-ray Absorption Study of Gillespite

P. F. Schofield1, G. van der Laan2, C. M. B. Henderson2, 3 and G. Cressey1
1 Department of Mineralogy, Natural History Museum, Cromwell Road, London SW7 5BD, UK
2 Synchrotron Radiation Department, Daresbury Laboratory, Warrington WA4 4AD, UK
3 Department of Earth Science, University of Manchester, Manchester M13 9PL, UK

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: gillespite • X-ray absorption spectroscopy • linear dichroism

Mineralogical Magazine; February 1998 v. 62; no. 1; p. 65-75; DOI: 10.1180/002646198547477
© 1998, The Mineralogical Society
Mineralogical Society (www.minersoc.org)