Natural linear dichroism in pyrite (FeS2): experiments and calculations.
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.
Cabaret
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D
LMCP, UMR7590, Paris, France. cabaret@lmcp.jussieu.fr
Brouder
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C
Arrio
M A
MA
Sainctavit
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P
Joly
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Y
Rogalev
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A
Goulon
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J