[Ifeffit] problem with Athena's E0 !
Bahia.Arezki at uni-siegen.de
Wed Jul 1 06:36:47 CDT 2009
I am using Athena (version: 08.058) to study the changes in the XANES profiles as a function of temperature of an organometallic compound containing Fe. I have a problem with the E0 value suggested by Athena : I noticed that it is not taking the same maximum in the first derivative.
I am sending 2 examples of xanes taken at RT ( E0 guessed is 1722.8 eV ) and 10 K (1727.3 eV !), can any one help me please to solve this problem ? should I force athena to take the first maximum at 1722 eV ?
I tough that my spectra have been properly calibrated: I first calibrated the iron foil -reference channel (E0=1712 eV) of a sample xanes and then I aligned the rest of the reference channels to that one. I though this was enough to calibrate my data. can you please tell me if my data processing is correct?
I need to be sure about the E0 value in order to know the correct shift of the different xanes features as a function of temperature. Also, with a wrong E0 the normalization is not correct...did I miss an important step?
I am having hard time with these basic questions...before using linear combination analysis and peak fitting analysis. Of course I have already looked in the IFFEFIT archive, but I did not find such problem. I only found a question about a wrong E0 because taken before the edge which is not my case.
Thanks so much for your time,
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