Hi Matt and XAFS community I am interested in the details of how IFEFFIT handles phase correction. I asked a similar question in April, but have only now begun to address its use in my work. In your response to my April question, you described how to do a central atom phase shift (without a FEFF path) and a combined central-atom and scattering-atom phase-shift (using a particular FEFF path). In the case of the combined central-atom/scattering-atom phase-shift, is the Chi(k) multiplied by exp(i*Phase(Central-atom)) and exp(i*Phase(scatterer)) before FFT? If this is true, how can I correct for the scattering atom phase shift "only" as has been described by Lee and Beni (Phys. Rev.B, 15, 1977, pg 2862) and Vaarkamp (Cat. Today, 39, (1998), pg 271). At this time, my particular interest is in attempting to identify clearly next-nearest neighbors in the RSF before attempting to do fitting. It is my hope that a positive identification of the next-nearest neighbor by means of IM analysis/ and or k-weighting will add validity to my final fitting results. Thank you for your help, Ian Drake