I agree.&nbsp;<br><br>To see if the problem is at high k, just make three copies of the data and then ft it with larger values for kmax. &nbsp;That would indicate noise as the problem.<br><br>You can do the same at low k by adjusting kmin. That would indicate a problem with the background.<br><br>You can find examples of these methods in my book chapter. &nbsp;Send me an email and I'll send it to you.<br><br>Tht<br>Shelly<br><br><span style="font-family:Prelude, Verdana, san-serif;"><br><br></span><span id="signature"><div style="font-family: arial, sans-serif; font-size: 12px;color: #999999;">-- Sent from my Palm Prē</div><br></span><span style="color:navy; font-family:Prelude, Verdana, san-serif; "><hr align="left" style="width:75%">On May 13, 2010 4:53 PM, Stefan Mangold &lt;stefan.mangold@iss.fzk.de&gt; wrote: <br><br>Hello,<div><br></div><div>to ideas coming into my mind without an look at your data:</div><div><br></div><div>1. Very noisy data ... (may produce to many peaks)</div><div>2. problems with the background correction</div><div><br></div><div>regards</div><div><br></div><div>Stefan</div><div><br><div><div>Am 13.05.2010 um 23:34 schrieb María Elena Montero Cabrera:</div><br class="Apple-interchange-newline"><blockquote type="cite">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?<br><br>Maria Elena <br>
<br><div class="gmail_quote">2010/5/13 Frenkel, Anatoly <span dir="ltr">&lt;<a href="mailto:frenkel@bnl.gov">frenkel@bnl.gov</a>&gt;</span><br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
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.<br>

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.<br>
<br>
Anatoly<br>
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________________________________<br>
<br>
From: <a href="mailto:ifeffit-bounces@millenia.cars.aps.anl.gov">ifeffit-bounces@millenia.cars.aps.anl.gov</a> on behalf of mohamed sobhy<br>
Sent: Thu 5/13/2010 5:21 PM<br>
To: <a href="mailto:ifeffit@millenia.cars.aps.anl.gov">ifeffit@millenia.cars.aps.anl.gov</a><br>
Subject: [Ifeffit] fitting<br>
<div><div></div><div class="h5"><br>
<br>
Dear all<br>
I am trying to use artemis to do fitting to CeO2. But really I cant get the right way to do that.<br>
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<br>
so can you suggest me what to do<br>
<br>
thanks<br>
<br>
Mohamed<br>
<br>
<br>
<br>
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<br></blockquote></div><br><br clear="all"><br>-- <br>María Elena<br><br>Dra. María Elena Montero Cabrera<br>Departamento de Medio Ambiente y Energía<br>Centro de Investigación en Materiales Avanzados (CIMAV)<br>Miguel de Cervantes 120, Compl. Ind. Chihuahua<br>
Chihuahua CP 31109, Chih. México<br>Tel (614) 4391123<br>
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<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div><span class="Apple-style-span" style="font-family: Times; font-size: 13px; -webkit-border-horizontal-spacing: 2px; -webkit-border-vertical-spacing: 2px; ">--<br>Dr. Stefan Mangold<br>Institut für Synchrotronstrahlung<br>Forschungszentrum Karlsruhe<br>Tel.: +49-7247-826073</span></div></span>
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