[Ifeffit] Basic questions about the preliminary data processing in Athena

Carlo Segre segre at iit.edu
Sun Jul 22 17:30:17 CDT 2018

Hello Haifeng:

Personally, I would not calibrate the data but merely align the references 
of A2 and A3 to the reference of A1 and similarly align B2 and B3 
references to that of B1.  Once merged, you can then aligh the 
reference of the merged B samples to that of the merged A samples.

If you keep the references then you can always align data taken at a leter 
time to these data sets.  If the energy of your reference is a small bit 
off from the tabulated value, that is OK as long as all the data being 
compared has aligned references.


On Sun, 22 Jul 2018, Haifeng Li wrote:

> Dear ALL,
> I am a beginner in Athena. Recently I got the spectra and I am confusing
> about the data calibration and alignment. The manual shows that calibrate
> the reference data of one scan and align other reference data to that
> calibrated one.
> Here I want to show examples. I have two samples A and B, Each sample has
> three scans with the corresponding reference data. For sample A, 1st scan
> is calibrated and the other two scans are aligned to 1st scan. Then merge
> them into merged A. The same procedures for sample B and get merged B. If I
> want to compare XANES of sample A and B, do I need to align the merged
> reference data between A and B? If so, why? My understanding is that all
> scans (original data and merged data) in sample A and B are calibrated to
> standard edge energy. Why do they need to align?
> I appreciate your help.
> Thanks,
> Haifeng

Carlo U. Segre -- Duchossois Leadership Professor of Physics
Interim Chair, Department of Chemistry
Director, Center for Synchrotron Radiation Research and Instrumentation
Illinois Institute of Technology
Voice: 312.567.3498            Fax: 312.567.3494
segre at iit.edu   http://phys.iit.edu/~segre   segre at debian.org

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