Abstract

Photoabsorption spectra for sodium nitroprusside and potassium ferricyanide single crystals at and above the Fe K-edge are reported. Both, near edge structure (XANES) and the extended fine structure (EXAFS) exhibit a strong dependence on the angle between the polarization vector of the radiation and the orientation of the single crystals. The XANES results allow a determination of the unoccupied electronic states of these materials. The EXAFS data yield distances FeC (FeCN), FeN (FeNO), FeC (FeCN) of 1.93, 1.63, 1.93 Å for Na 2[Fe(CN) 5 NO]·2H 2O and K 3[Fe(CN) 6], respectively. The second shell of neighbours is found to contribute extraordinarily strong to the EXAFS oscillations.

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