Hi Piotr,
Matt wrote everything, but I have 2 small comments:
- Fe environment if it is oxide or metallic state can be visible
directly from the distance in most cases.
- Piotr, you wrote nothing about composition (and detection method and
preparation of the sample for the experiment) - only that you have 6
additional elements, what is stoichiometry and what kind of elements?
This information can decrease the number of input parameters...
Giving you advise knowing nothing about your sample is as a guesswork...
Regards
kicaj
W dniu 13-08-24 23:18, "Piotr J. Bardziński" pisze:
Dear Sir or Madam,
I got a normalized Fe K-edge EXAFS spectrum for my amorphous
7-component alloy sample, for which I know its atomic percent
composition.
I need to find out the interatomic distances between the Fe and the
other atoms present in the alloy (identify the peaks in R-space) as
well as how many atoms of each element is surrounding the absorbing
iron atom (coordination number).
To meet my goal, I think I need to fit the R-space Fourier transform
of my EXAFS spectrum in a program like Artemis. Unfortunately, I
haven`t found any tutorial discussing how to deal with amorphous
sample with unknown organization of the atoms. When you are about to
prepare an atomic model in Artemis for fitting, you need to build a
model with an initial interatomic distances, atomic coordination
number, etc, but all that is obviously unknown to me. I know nothing
about the short range order in my material and I want to learn it from
the experiment itself (note that itcan be and most probably is
different from the one present in crystalline structures). So, my
question is, could somebody tell me how to deal with such system using
the Artemis, what type of initial models for fitting should be prepared?
All of your help will be greatly appreciated.
Best regards,
Piotr Bardziński,
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