[Ifeffit] fitting

[Stefan Mangold]

Hello,

to ideas coming into my mind without an look at your data:

1. Very noisy data ... (may produce to many peaks)
2. problems with the background correction

regards

Stefan

Am 13.05.2010 um 23:34 schrieb María Elena Montero Cabrera:

> I don't know anything about CeO2, but...for me there is something wrong since the Athena fitting, because there are too many peaks below the main one, and specially below 1 A. Am I right or not?
> 
> Maria Elena 
> 
> 2010/5/13 Frenkel, Anatoly <frenkel at bnl.gov>
> There is a large number of articles explaining how to fit CeO2 including discussions why multi-electron excitatoins complicate the fit, and some of those authors (e.g., A. Soldatov, but also M. Benfatto) propose first principle methods that account for those.
> Some papers even show that ignoring those contributions may give a decent fit, but you should be aware of the multitudes of theoretical issues surrounding EXAFS modeling of this system before trying it on your own.
> 
> Anatoly
> 
> 
> 
> ________________________________
> 
> From: ifeffit-bounces at millenia.cars.aps.anl.gov on behalf of mohamed sobhy
> Sent: Thu 5/13/2010 5:21 PM
> To: ifeffit at millenia.cars.aps.anl.gov
> Subject: [Ifeffit] fitting
> 
> 
> Dear all
> I am trying to use artemis to do fitting to CeO2. But really I cant get the right way to do that.
> During the fitting, I am using amp as set and change in N degeneracy of the path. attached is the best fit i got but it still not good and the chi-square is 41.109065479
> so can you suggest me what to do
> 
> thanks
> 
> Mohamed
> 
> 
> 
> 
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> 
> 
> -- 
> María Elena
> 
> Dra. María Elena Montero Cabrera
> Departamento de Medio Ambiente y Energía
> Centro de Investigación en Materiales Avanzados (CIMAV)
> Miguel de Cervantes 120, Compl. Ind. Chihuahua
> Chihuahua CP 31109, Chih. México
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--
Dr. Stefan Mangold
Institut für Synchrotronstrahlung
Forschungszentrum Karlsruhe
Tel.: +49-7247-826073

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