On Wednesday 01 July 2009 10:08:25 am Arezki, Bahia wrote:
It seems that ATHENA gives a spurious value for E0 (1728 eV for S36 xanes) due to a shoulder in the rising part of the white line which is quite intense at RT (s11) and decreases during the cooling of the sample. So, for s36 xanes at 10 K, ATHENA is simply taking the highest maximum in the 1st derivative which is this time higher in energy than the first one .
I have to object to this characterization. Athena has not done anything "spurious". In fact, in your case, it seems to have behaved exactly as documented. As Jeremy said, it is the responsibility of *you, the user* to correctly process your data. Athena is merely a computer program -- it can offer nothing more than default values and some simple algorithms. Sadly, science is not so simple that it can be done without the attention of a human. B -- 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/