Chemical environment determination of iron oxides using RRS spectroscopy

JUAN JOSÉ LEANI; HÉCTOR JORG ESÁNCHEZ; MARÍA CECILIA VALENTINUZZI; CARLOS PÉREZ

X Ray Spectrometry

John Wiley & Sons, Ltd.

Año: 2011 vol. 40 p. 254 - 256

1097-4539

This article presents first results of determination of the oxidation state of several Fe samples by means of resonant Raman scattering spectroscopy (RRS) using monochromatic synchrotron radiation with an energy dispersive system. Measurements were carried out at the XRF station of the D09B-XRF beamline at Brazilian synchrotron facility (LNLS, Campinas, Brazil). The samples were irradiated with monochromatic photons having energy close and lower than the K absorption edge of Fe in order to inspect the RRS emissions. The RRS spectra were analyzed with specific programs for fitting the experimental data to theoretical expressions. Then, residuals were determined in the low-energy side of the RRS peaks. These residuals were treated with Fast Fourier Transform (FFT) smoothing methods taking into account the instrument functions of the detecting system. The residuals show an oscillation pattern that depends on the studied sample, i.e. on the oxidation state of Fe. The changes existing in the RRS structure between Fe and its oxides are clearly discriminated, suggesting chemical environment characterization by RRS spectroscopy using an energy dispersive system combined with synchrotron radiation.