[Ifeffit] Shifted data in Athena

George Sterbinsky GeorgeSterbinsky at u.northwestern.edu
Fri Mar 8 22:43:27 CST 2013


In attempting to reproduce the steps that I performed before I noticed the
shift, I am now unable to deglitch the data, and obtain the attached error
instead. I'm not certain this is related to the shift, but it may be.

If anyone is interesting in attempting to reproduce the steps to obtain
this message on their own system, let me know and I will send you the
project and instructions.

Thank you,

On Fri, Mar 8, 2013 at 9:48 PM, George Sterbinsky <
GeorgeSterbinsky at u.northwestern.edu> wrote:

> Hi Anatoly,
> I've checked with other software and the shift is not present. You can
> also tell the shift has some other origin by choosing to show data points
> in the preferences. This way you can see the data points do not match in
> energy, as one might expect for data and a reference. This can also been
> seen by looking at the beginning and ending of the spectra, which begin and
> end at different energy. Also, note the energy shift parameter for both
> groups is set to zero.
> Thank you,
> George
> On Fri, Mar 8, 2013 at 9:25 PM, Anatoly I Frenkel <afrenke2 at yu.edu> wrote:
>>  Maybe the shift is real due to chemical shift of the sample relative to
>> reference material?
>> Sent from my mobile phone, please forgive typos
>> ----- Reply message -----
>> From: "George Sterbinsky" <GeorgeSterbinsky at u.northwestern.edu>
>> To: "XAFS Analysis using Ifeffit" <ifeffit at millenia.cars.aps.anl.gov>
>> Subject: [Ifeffit] Shifted data in Athena
>> Date: Fri, Mar 8, 2013 9:15 PM
>>   Hello,
>>  I have attached an (D)Athena project with containing two groups,
>> imported as a primary data set and a reference. The groups were therefore
>> imported on the same energy grid. However, when plotted, the energy values
>> of the data points for the two groups are clearly shifted with respect to
>> each other. Can someone please explain the origin of this shift?
>>  Thank you,
>> George
>> _______________________________________________
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>> Ifeffit at millenia.cars.aps.anl.gov
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