Re: [Ifeffit] Artemis\Plot mismatch\Artemis[Plot] [Feff] Atoms and Feff

[Ravel, Bruce]

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   bra...@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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[Ifeffit] Artemis\Plot mismatch\Artemis[Plot] [Feff] Atoms and Feff

[Huaming]

Dear all,


I am using Artemis for EXAFS data fitting and 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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