From the Athena User's Guide:
http://cars9.uchicago.edu/~ravel/software/doc/Athena/html/params/e0.html B On Wednesday 01 July 2009 07:36:47 am you wrote:
Hi all,
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,
Bahia
-- Bruce Ravel ------------------------------------ bravel@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/