Arsenic Speciation by X-Ray Spectroscopy using Resonant Raman Scattering

SÁNCHEZ H.J.; LEANI J.; PÉREZ C.A.; PÉREZ R.D.

Campinas

Otro; Turno de medición; 2011

Recently, x-ray Resonant Raman Scattering spectroscopy has been successfully employed to determine the oxidation state of metals. This procedure can be attained with conventional XRF spectrometers or with TXRF systems, although the best performance is obtained when synchrotron sources are used. When atoms are irradiated by X ray photons different kinds of interactions take place: the photon can be absorbed by the photoelectric effect or can suffer a Rayleigh or Compton scattering. However, under resonant conditions, other low probability interactions can occur. One of these interactions is the resonant Raman scattering (RRS). In the last few years experiments of RRS has become a powerful technique to investigate electronic states in solids. In this work we use RRS spectroscopy to perform arsenic speciation.