EDIXS: A versatile spectroscopic tool for chemical state characterizations

J. J. LEANI; J. ROBLEDO; H. J. SÁNCHEZ

Campinas

Congreso; 31 RAU - Annual Users Meeting LNLS; 2021

CNPEM

In X-ray fluorescence analysis, spectra present singular characteristics produced by the different atomic and molecularprocesses. When atoms are irradiated with incident energy lower but close to an absorption edge, scattering peaksappear due to an inelastic process known as Resonant Inelastic X-ray Scattering (RIXS), or X-ray Resonant RamanScattering (RRS) [1]. In general, RIXS studies are carried out in third or fourth generation synchrotron facilities usinghigh-resolution systems for detection. The RIXS peaks present a variety of particular features; between them, acharacteristic long-tail spreading to the region of lower energies. In the past decade it has been observed that, hiddenin this tail, there is valuable information about the local environment of the atom under study. In addition, it has beendemonstrated that RIXS spectroscopy can be attained using low-resolution systems, i.e., solid state detectors. Thisgave place to a new technique named EDIXS (Energy-dispersive Inelastic X-ray Scattering)[2].One of the most important features of the EDIXS methodology is the possibility of combining it with the experimentalmethods and geometries associated with usual XRF spectroscopy and all its non-conventional associated techniques.Combinations of EDIXS spectroscopy with total reflection, depth-profiling analysis using grazing incidence geometriesand even confocal arrangements have been reported during the last decade [3-13]. Among the distinctive features ofthe EDIXS technique reported in these works, the use of an energy dispersive spectrometer for measuring the RIXSspectra and the application of Multivariate Methods for an objective data analysis should be remarked. As result, avariety of samples of interest have been successfully analyzed and characterized, from contaminated waters tolithium-ion battery materials.In this presentation, the basis, advantages, potentiality and the state-of-the-art of this versatile tool for chemical statedeterminations will be presented and discussed.