[Ifeffit] How to fit "N" number of Neigbors in (D)Artemis?

Wei Li weili at udel.edu
Mon Aug 20 08:53:13 CDT 2012


Hi, Bruce,

Does that mean each shell has a different S02 value?

Wei

On Mon, Aug 20, 2012 at 9:44 AM, Bruce Ravel <bravel at bnl.gov> wrote:

> On Monday, August 20, 2012 09:02:28 PM Huaming Guo wrote:
> > I am using the (D)Artemis for EXAFS fitting. However, the "N" is set to
> be a
> > constant in the (D)Artemis. We can not set the variable for this
> parameter.
> > How can I do that if I model non crystalline samples using (D)Artemis?
> > Thanks a lot.
>
> In Artemis, N is a pure number, but S02 can take a math expression.
>
> In the EXAFS equation, N and S02 are multiplied together.
>
> Thus, you might consider parameterizing the amplitude by setting N to
> 1 and putting all of the parameterization in the math expression for
> S02.
>
> B
>
>
> --
>
>  Bruce Ravel  ------------------------------------ bravel at bnl.gov
>
>  National Institute of Standards and Technology
>  Synchrotron Methods Group at NSLS --- Beamlines U7A, X24A, X23A2
>  Building 535A
>  Upton NY, 11973
>
>  Homepage:    http://xafs.org/BruceRavel
>  Software:    https://github.com/bruceravel
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-- 
Wei Li

Postdoc researcher
Environmental Soil Chemistry Group
Delaware Environmental Institute
University of Delaware, Newark,19713
Tel:631-949-0663
http://ag.udel.edu/soilchem/li.html <http://ag.udel.edu/soilchem/>
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