Characterization & Correction of Self-Absorption Distortion in XANES

Reddy, Aidan; Mehta, Apurva

X-ray absorption spectroscopy (XAS) is an experimental technique used to probe the atomic properties of materials. XAS measurements performed in fluorescence mode are subject to so-called “self-absorption” distortion, especially when the sample under investigation is thick or concentrated with respect to the atom of interest. Here we investigate the behavior of self-absorption and present several suggestions to avoid and manage self-absorption through experimental design. Particularly, we find that it is easier to correct for very thick samples than for samples of intermediate thickness. Self-absorption distortion necessitates a correction of the measured spectrum during data processing. We present a technique for correcting self-absorbed spectra in the XANES region that is effective for all sample thicknesses and experimental geometries.


Also Published In

Columbia Undergraduate Science Journal

More About This Work

Published Here
August 18, 2022