[Ifeffit] Warning "e0 is greater than 10"

Bruce Ravel bravel at bnl.gov
Tue Oct 14 13:36:27 CDT 2014


On 10/14/2014 02:20 PM, Carlo Segre wrote:
> Yes, if you change the position of your E0 in Athena, it will result in a
> shift in your fit parameters.  However, don't simply shift your E0 just
> to avoid the warning.  Take a look to see if Athena mispositioned it
> first but if you are confident that it is correct, then you might take a
> look to see if E0 is large because you are not using a good model to fit
> the data. E0 is highly correlated with the path lengths so if you are
> way off in the latter, it can have an effect on E0.

Also make sure that you computed the XAS for the correct edge.  That is, 
make sure you ran Feff for the L3 edge rather than the K edge!

B


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

  National Institute of Standards and Technology
  Synchrotron Science Group at NSLS --- Beamlines U7A, X24A, X23A2
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