[Ifeffit] Background Subtraction

Bruce Ravel bravel at bnl.gov
Mon Aug 25 12:50:03 CDT 2008

On Monday 25 August 2008 11:23:49 Hashem Stietiya wrote:
> Dear Dr. Ravel,
> I am trying to optimize background removal of my spectra by setting the
> Rbkg to half the distance of the first shell peak. However, when I import
> my spectra in ATHENA, I notice that the edge step is a very large number
> and when converting to R space there are no well defined peaks. If I click
> on 'fix step', the R space becomes comprehendible and peaks appear. Do I
> continue using the 'fix step' and then setting Rbkg to half the distance of
> the first shell peak?

I agree with Scott.  The most likely problem is that either the
pre-edge or post-edge line (or both) is computed wrongly.

Here is the documenta page on normalization:



 Bruce Ravel  ------------------------------------ bravel at bnl.gov

 National Institute of Standards and Technology
 Synchrotron Methods Group at NSLS --- Beamlines U7A, X24A, X23A2
 Building 535A
 Upton NY, 11973

 My homepage:    http://xafs.org/BruceRavel
 EXAFS software: http://cars9.uchicago.edu/~ravel/software/exafs/

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