6.6.3 Phase-Corrected XAFS Fourier Transforms

The XAFS Fourier transform $\tilde{\chi}$(R) is well-known to have peaks at R values considerably lower than the neighbor distances. The difference between the peak in $\tilde{\chi}$(R) and the neighbor distance is typically $\sim$ - 0.5 Å. This difference is well-understood to be due to the scattering phase-shift, the $\delta$(k) term in the XAFS equation:

$$\chi$$(k) =