[Ifeffit] choosing k-weight

[Kelly, Shelly D.]

> Dear Ifeffiters,
> 
> I'm wondering what principles you have to determine the appropriate 
> k-weight to use for FTs. Until now I've used guidelines from 
> a textbook by 
> Teo, based on the Z of the backscattering atoms:
> Z > 57; kw = 1
> 57 > Z > 36; kw = 2
> Z < 36; n = 3
> 
> Of course you can have different backscatterers around your 
> absorber - I've 
> got C, N and Pt! Are there any other rules you follow?
> 
> Thanks very much in advance!
> 
> Peter


Hi Peter,

I have found it very useful to use all three kweights, simultaneously.
You can really cut down of the correlation between the different EXAFS
parameters by doing so.

This paper shows a model that was fit to the data with all three
kweights. 
Geo. Cosmo Acta 66(22): pp 3855-3871, November 2002.

I have been thinking about putting together an Artemis project file that
shows how to do this.  If there is interest, I would be willing.

Shelly

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