Re: [Ifeffit] fitting

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 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@millenia.cars.aps.anl.gov on behalf of mohamed sobhy Sent: Thu 5/13/2010 5:21 PM To: ifeffit@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

_______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit

-- 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 Tel (614) 4391123 _______________________________________________ Ifeffit mailing list Ifeffit@millenia.cars.aps.anl.gov http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit

-- Dr. Stefan Mangold Institut für Synchrotronstrahlung Forschungszentrum Karlsruhe Tel.: +49-7247-826073