title: Natural linear dichroism in pyrite (FeS2): experiments and calculations.
abstract: Electric quadrupole transitions are revealed through the angular dependence of X-ray absorption spectra in a cubic crytal. Data collection was achieved at the iron K-edge in pyrite (FeS2) by using the angular moment method developed for X-ray Natural Circular Dichoism (XNCD) measurements. The natural linear dichroism (XNLD) was found to be around 0.5% of the edge jump. Experimental results are compared with monelectronic and multilectronic calculations. Calculations allow to quantitatively determine the proportion of quadrupolar transitions in the pre-edge structure and the anisotropy is explained in terms of structural and electronic parameters.
authors.affiliation: LMCP, UMR7590, Paris, France. cabaret@lmcp.jussieu.fr
authors.forename: D
authors.initials: D
authors.lastname: Cabaret
authors.forename: C
authors.initials: C
authors.lastname: Brouder
authors.forename: M A
authors.initials: MA
authors.lastname: Arrio
authors.forename: P
authors.initials: P
authors.lastname: Sainctavit
authors.forename: Y
authors.initials: Y
authors.lastname: Joly
authors.forename: A
authors.initials: A
authors.lastname: Rogalev
authors.forename: J
authors.initials: J
authors.lastname: Goulon