[Ifeffit] Ifeffit Digest, Vol 104, Issue 22

Lauren Glowzenski lauren.glowzenski at gmail.com
Fri Oct 14 09:34:26 CDT 2011


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On Fri, Oct 14, 2011 at 10:14 AM, <ifeffit-request at millenia.cars.aps.anl.gov
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>   1. Re: Gold Nanoparticle first shell fitting (Kaiser, Julian)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 14 Oct 2011 14:14:00 +0000
> From: "Kaiser, Julian" <julian.kaiser at helmholtz-berlin.de>
> To: XAFS Analysis using Ifeffit <ifeffit at millenia.cars.aps.anl.gov>
> Subject: Re: [Ifeffit] Gold Nanoparticle first shell fitting
> Message-ID: <DE491AE4BEF1864DB8831D1BC0E7EA1A0E554D33 at didag2>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Dear Anatoly,
>
> thanks a lot for your reply!
> I don't see the problem yet. In the attached file
> ("different_Au_foils.prj), there are two different gold reference foils
> measured at two different synchrotrons. There is some difference but not
> realy much. Could you please describe the regions that are worse comparing
> my gold foil-file to yours, or if possible, attache the file with both foils
> or at least a screenshot of the plot?
>
> Best regards,
> Julian
>
>
>
> ________________________________
> Von: ifeffit-bounces at millenia.cars.aps.anl.gov [
> ifeffit-bounces at millenia.cars.aps.anl.gov]" im Auftrag von "Anatoly I
> Frenkel [afrenke2 at yu.edu]
> Gesendet: Dienstag, 11. Oktober 2011 20:29
> Bis: XAFS Analysis using Ifeffit
> Betreff: Re: [Ifeffit] Gold Nanoparticle first shell fitting
>
>
> Something is horribly wrong with the data here.
>
> I overplotted your reference Au foil against mine, and yours has distorted
> XANES and too high EXAFS intensity compared to my data. Your amplitude
> factor is 1.54 which also confirms that something was wrong in the
> experiment. Perhaps - a misalignment? The NP data also look strange...
>
> I would not focus on the NP analysis until you figure out why your foil
> data is so strange.
>
>
>
>
>
> ________________________________
> From: ifeffit-bounces at millenia.cars.aps.anl.gov [
> ifeffit-bounces at millenia.cars.aps.anl.gov] on behalf of Kaiser, Julian [
> julian.kaiser at helmholtz-berlin.de]
> Sent: Tuesday, October 11, 2011 1:06 PM
> To: ifeffit at millenia.cars.aps.anl.gov
> Subject: [Ifeffit] Gold Nanoparticle first shell fitting
>
> Dear Ifeffit Community,
>
> I'm trying to fit a gold nanoparticle in the size of about 2 nm that is
> immobilized by polymers. For my research it's enought to fit the first shell
> only, becaues all I would like to analyze is the atomic distance in the
> nanoparticle. After the (hopefully) correct background substraction in
> Athena (athena file attached), there is a shoulder at approx. 2.1 Angstr?m
> in the R-space.
> In Artemis, fitting this shoulder seems not to be possible, while the fit
> for the reference (gold foil) seems to be fine. (both artemis files are
> attached to the e-mail).
> If the k-range is decreased from 12.388 to a value between 9 an 10, the
> shoulder disappears and the fit works fine. But I think by this change I
> might modify the data too much.
> Would be really nice, if sombody has an idea how to deal with the problem,
> to get a hint how to solve this.
>
> Thanks a lot,
> Julian
>
> ________________________________
>
> Helmholtz-Zentrum Berlin f?r Materialien und Energie GmbH
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> ________________________________
>
> Helmholtz-Zentrum Berlin f?r Materialien und Energie GmbH
>
> Mitglied der Hermann von Helmholtz-Gemeinschaft Deutscher Forschungszentren
> e.V.
>
> Aufsichtsrat: Vorsitzender Prof. Dr. Dr. h.c. mult. Joachim Treusch, stv.
> Vorsitzende Dr. Beatrix Vierkorn-Rudolph
> Gesch?ftsf?hrer: Prof. Dr. Anke Rita Kaysser-Pyzalla, Dr. Ulrich Breuer
>
> Sitz Berlin, AG Charlottenburg, 89 HRB 5583
>
> Postadresse:
> Hahn-Meitner-Platz 1
> D-14109 Berlin
>
> http://www.helmholtz-berlin.de
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