XAFS Spectroscopy as a Speciation Tool
Measure changes in the absorption coefficient μ(E) as a function of the incident radiation x-ray energy. log(I0/I1)=μ*d
result or object of interest:
XANES : valence and coordination geometry. Interpretation through comparison to reference spectra („fingerprint“) or to theoretical calculations.
EXAFS :interatomic distances (up to ~5-6 Å), number and type of nearest neighbors
EXAFS analysis yields distances within 0.02 Å, coordination numbers within ~20%, neighbor type within Z±1