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

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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