[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
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