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than "Re: Contents of Ifeffit digest..." Today's Topics: 1. Re: Gold Nanoparticle first shell fitting (Kaiser, Julian) ---------------------------------------------------------------------- Message: 1
Date: Fri, 14 Oct 2011 14:14:00 +0000
From: "Kaiser, Julian" 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@millenia.cars.aps.anl.gov [
ifeffit-bounces@millenia.cars.aps.anl.gov]" im Auftrag von "Anatoly I
Frenkel [afrenke2@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@millenia.cars.aps.anl.gov [
ifeffit-bounces@millenia.cars.aps.anl.gov] on behalf of Kaiser, Julian [
julian.kaiser@helmholtz-berlin.de]
Sent: Tuesday, October 11, 2011 1:06 PM
To: ifeffit@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 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 ________________________________ 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