[Ifeffit] New Method for Normalization?

Bruce Ravel bravel at anl.gov
Thu Sep 29 16:20:18 CDT 2005

On Thursday 29 September 2005 15:48, Barton, David (DG) wrote:
> Has anyone considered using the methods of Penner-Hahn to normalize their
> data to get reliable intensities of near-edge features?  The reference to
> their method of normalization is below:
> J. Synchrotron Rad. (2005). 12, 506-510    [doi:10.1107/S0909049504034193]
> "A method for normalization of X-ray absorption spectra"
> T.-C. Weng, G. S. Waldo and J. E. Penner-Hahn
> It is my understanding the Ifeffit uses a linear function to remove the
> pre-edge and a quadratic for the post-edge and that the Athena's flatten is
> a subtraction of these functions.  This is an excellent method under most
> scenarios since the background is usually fairly smooth and can be well
> approximated by a quadratic equation.  Personally, I have had only a few
> rare cases where the quadratic function on the post-edge was not sufficient
> to reliably normalize the data and in those cases a third-order polynomial
> was sufficient.  Does anyone else have an opinion on using alternative
> normalization routines?

Isn't Ifeffit's Cromer-Liberman normalization scheme substantially
similar to the method presented in that paper?


 Bruce Ravel  ---------------------------------------------- bravel at anl.gov

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