[Ifeffit] Artemis\Plot mismatch\Artemis[Plot]&Artemis [Feff] Atoms and Feff
Ravel, Bruce
bravel at bnl.gov
Mon Jan 11 18:48:54 CST 2021
Question 1: As explained here:
https://bruceravel.github.io/demeter/documents/Artemis/feff/paths.html#path-plotting-and-path-geometry
the plot made form the paths tab of the Feff window make no effort to
set parameters like S02 and sigma^2 to sensible values. The plots made
from the Data window probably have values for S02 and sigma^2 not equal
to 1 and 0, respectively.
Question 2: See
https://speakerdeck.com/bruceravel/the-ramsauer-townsend-effect-in-x-ray-absorption-spectroscopy
a topic which is also explained in many other places by many other people.
B
On 1/10/21 9:49 PM, Huaming wrote:
> Dear all,
>
> I am using Artemis for EXAFS data fittingand found that the |χ(R)| plot
> shown in "Artemis [Plot]" and "Artemis [Feff] Atoms and Feff" are in
> great difference for a same scattering path. However, the |χ(k)| plots
> shown in the above two windows is the same. For the plot shown in
> "Artemis [Feff] Atoms and Feff" window, one path is selected and 'Plot
> path' is clicked. For the plot shown in "Artemis [Plot]", the same path
> is dragged into the "Artemis window" and then transfered path and plot
> in R by click "Action" menu. I would like to know what is the
> difference of data shown in the two windows.
>
> BTW, whether it is possible to have two peaks in the |chi(R)| plot for a
> single scattering path? For some scatters with high-Z, the f(k) may
> feature multiple peaks.
>
> Thanks,
>
> All bests,
>
> Huaming Hou
>
>
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--
Bruce Ravel ------------------------------------ bravel at bnl.gov
National Institute of Standards and Technology
Synchrotron Science Group at NSLS-II
Lead Beamline Scientist, 6BM (BMM)
Building 743, Room 114
Upton NY, 11973
Homepage: http://bruceravel.github.io/home/
Beamline: https://www.bnl.gov/ps/beamlines/beamline.php?r=6-BM
Software: https://github.com/bruceravel
Demeter: http://bruceravel.github.io/demeter/
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