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.

Carlo

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@iit.edu   http://phys.iit.edu/~segre   segre@debian.org
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