First Characterization of Chemical Environments using Resonant Inelastic X-ray Scattering (RIXS) induced by an X-ray tube beam

PÉREZ R.D.; LEANI J.; ROBLEDO, J.; SÁNCHEZ, H.J.

Brescia

Conferencia; 17th International Conference on Total Reflection X-Ray Fluorescence Analysis and Related Methods; 2017

Resonant Inelastic X-Ray Scattering (RIXS), also named X-ray Resonant Raman Scattering (RRS), was recently applied for the discrimination of local chemical environments. By means of this novel technique, the speciation of samples were attained in a variety of samples and experimental conditions, as total reflection, grazing incidence and confocal setups. Until now, due to the requirement of a monochromatic and intense exciting beam, this RIXS tool had been applied using exclusively synchrotron radiation sources. In this work we present, for the very first time, results of measurements using the novel RIXS tool for chemical characterization applied in a conventional X-ray tube based laboratory. The measurements were perform at the Non-Conventional XRF Techniques Laboratory of the Atomic and Nuclear Spectroscopy Group at the National University of Córdoba, Argentina. The experimental setup, designed especially for this kind of experiences, is mainly composed by an X-ray tube with a Mo anode, a Si(100) channel-cut monochromator, a versatile sample holder and a MOXTEK Si-pin diode x-ray detector model XPIN-XT (148eV @ Mn-Ka line).The studied samples were pure compounds of transition elements, as Cu. We performed all of the measurements in air atmosphere.Since the fine structure of each RIXS peak clearly depends on the studied compound, these results open the possibility of local environment characterization by means of RIXS using an energy dispersive system combined with a conventional X-ray tube.This promising RIXS tool, where synchrotron radiation is no need, would offer an unique opportunity to study chemical states in different kinds of samples, such as mineral, environmental and/or biological samples, at a local X-ray tube based laboratory; characterization nowadays impossible to achieve by other methods, such as conventional absorption techniques.