[Ifeffit] Help in background removal with Athena

[fred.mosselmans at diamond.ac.uk]

Hi Irina,
 I guess in a normal situation you would want to FT at least 5 k(1/A) range to get some sort of shape to your FT peaks which would normally be a range of about 2 -7 k so maybe 190 eV above the edge. However added to that the data has to be good, I am not a C XAS expert but looking at your data I am unsure that all the oscillations are due the x-rays scattering , some might be experimental artefact which would then make the analysis even less trustworthy. WRT your data after the signal begins to die about 400 eV, i.e. you have ca 110 eV of data I might trust on a good day and even then I'd be more reassured if these were several scans added rather than just one. (I can't tell if this is the case).
 I doubt there is useful stuff that can be extracted past that point.
Hence I think all that is probably there is the pre-edge changes in the XANES which I presume you are looking at as well.

Thanks
Fred


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