[Ifeffit] E0 on linear combination fitting: fit or not?

[Carrillo Sanchez, Pamela]

Hi all,

I have gone through the mail archives as well as following the instructions of Athena user's manual as well as Scott Calvin's book but still I find myself with the doubt of how correctly "choose E0". I have aligned the data and standards with the merge of reference foils measurements of the metal (Mn). We did not have a reference foil placed while measuring the data so I used the merge of the references scans when the standards were measured and they showed a consistent energy shift.
 I have set the same E0 for all the data and standard to the same E0, I chose the first peak of the derivative in the data (6MnRh_RED). When I do the LCF analysis without 'fitting E0' ,  I get a worse fitting than when I choose the fit E0 on Athena as well as different types of components on the fitting. Which one is the best choice for it ? From what I have read I think that without fitting E0 would be the proper one regardless of the "worse fit".

Also, I would like to know which fit range would be appropriate for this, I have chosen -20 to +30 eV due to the features of my data and ranges for XANES. Any recommendation.

I have attached the files for the project and screenshots of both fittings.

Any help is highly appreciated!

Pamela

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