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

Haifeng Li hli211 at uic.edu
Mon Jul 23 10:34:13 CDT 2018

Hi, Carlo,

Thanks for your answer.

I may ask you more questions. Why you do not recommend to calibrate the
data? Calibration is used to find the E0 and match it to the literature
data. What is the real difference between calibration and alignment?



On Sun, Jul 22, 2018 at 5:30 PM, Carlo Segre <segre at iit.edu> wrote:

> 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 at iit.edu   http://phys.iit.edu/~segre   segre at debian.org
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