[Ifeffit] limits for second shell

Kropf, Arthur Jeremy kropf at anl.gov
Fri Aug 21 09:10:43 CDT 2009


It looks like you haven't done the FT over the same k range for both data sets.  If you want to compare the FT amplitudes, that is an important step.

Jeremy Kropf

Chemical Sciences and Engineering Division
Argonne National Laboratory



-----Original Message-----
From: ifeffit-bounces at millenia.cars.aps.anl.gov on behalf of Scott Calvin
Sent: Fri 8/21/2009 8:48 AM
To: XAFS Analysis using Ifeffit
Cc: Calvin, Scott
Subject: Re: [Ifeffit] limits for second shell
 
Hi Eugenio,

To my eye, I strongly suspect there's real signal there. To confirm,  
try several different k-ranges and k-weights. If the feature persists,  
it is likely physical. (It may change size and shape to some extent.)

--Scott Calvin
Sarah Lawrence College

On Aug 20, 2009, at 11:54 PM, Eugenio Otal wrote:

> Hi,
> I have a sample of a pure Er2O3 (blue line in the attached graph)  
> and a sample of doped ZnO with erbium that has segregated the same  
> oxide (red line) by thermal treatmen.
> The signal for de segregated oxide gets noisy around k=9 because the  
> sample is so diluted, but the radial distribution shows second shell  
> signal, smaller than the pre oxide, but still a signal. My doubt is  
> about how to know if the second shell is real and if that second  
> shell can be useful to obtain information. Is there a criteria to  
> know that? Some limit in k-space?
> Thanks, euG
> <R.fig><k.fig>_______________________________________________
> Ifeffit mailing list
> Ifeffit at millenia.cars.aps.anl.gov
> http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit

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






More information about the Ifeffit mailing list