Re: [Ifeffit] Mathematical expressions for the path parameters in Fitting

17 Sep 2010

      Hi Brandon:

Here you go.

Good luck,
Shelly

On Fri, Sep 17, 2010 at 11:54 AM, Brandon Reese  wrote:
...
Hi Shelly,
I am also looking into different ways to constrain my EXAFS fits.  If you
wouldn't mind, I would also be very interested in a copy of your book
chapter.
Thanks,
Brandon
On Fri, Sep 17, 2010 at 9:40 AM, Shelly Kelly  wrote:
...
Hi Sumit:
There are a lot of different ways to constrain the EXAFS parameters in
a fitting model. Mostly they are determined by physically meaningful
relationships or through trial and error of "what works". I just sent
you my book chapter and you will find detailed discussion on many of
the common constraints in there. Another good place to look is in the
literature to find out what people have done for systems similar to
yours.
HTH,
Shelly
On Fri, Sep 17, 2010 at 1:01 AM,   wrote:
...
Hello,
In EXAFS data modeling carried out by fitting excercise, we develop
mathematical expressions for  different path parametrs as functions of a
smaller set of fitting parameters that can be adjusted to achieve to
best
fit to the data. I am carrying out EXAFS analysis of Eu(III) sorbed on
different environmentally relevent mineral oxides. In conection of this
i
also analysed some reference standard compounds. In developing
expression
for different path parameters, though i developed the expressions using
my
own  understanding and taking help from one of Shelly's tutorial
regarding
SnO2 case, i am not confident. Basically SS2, and deltaE expressions
puzzle me.
Could someone help me in understanding basic approach in developing
their
expressions(for reference Eu2O3 structure could be taken).
Regards,
Sumit
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