[Ifeffit] data after rebinning look worse in k-space than before?

[Carlo Segre]

Hi Ilya:

We always take data in this mode at APS Sector 10 and I have also find 
that the rebinning function is not working satisfactorily at this time.  I 
find that for the current version of the software it is better to merge 
your data and let IFEFFIT interpolate to the dk=0.05 grid that it uses.

Carlo


On Wed, 27 Jun 2018, Ilya Sinev wrote:

> Hi all,
>
>
>
> I have a question regarding the chi(k) function isolation and rebinning
> processes. I have some data recorded in ?quasi channel-cut? modus, i.e. with
> the mono constantly moving and the data points collected with the highest
> possible rate. With 180 sec measurement in yields to a spectrum of ca. 8600
> point, which obviously needs to be rebinned. The rebinned data, however,
> does not look good in k-space even if multiple data are merged. Moreover, I
> have an impression that the raw spectrum in k-space does not have those
> 8000+ points anymore but significantly less. Is there any reduction of the
> data points number that is not seen (e.g. as a preparation step for FT)?
> Since the unbinned data has higher quality, does it then make more sense to
> keep using it for EXAFS analysis?
>
>
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> Thank you
>
> Ilya Sinev
>
>
>
>

-- 
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