I think experimental answer could be the simplest one. Perhaps there is anyone
on the list who measured low concentrations of low Z absorber in the high Z
host at both edges?
For example, Cu in Ag (if does dissolve in Ag if made by rapid quenching) at Cu
K-edge, and Ag K-edge (or just bulk Ag since the data will be the same). These
should be solid solutions, of course.
Then, despite the difference in phase shift, the EXAFS oscillations should be
comparable in magnitude if the broadening is not significant, and it should be
more intense for the Cu K-edge if the broadening at Ag K edge is significant.
Another option: to hear from people doing HERFD. That is normally done on
XANES, for the reason, I assume, that they do not see any advantage in EXAFS
region, where broadening does not change compared to total fluorescence.
I think the explanation that EXAFS should not be too sensitive to the life time
broadening is that EXAFS originates from the final state interference, while
the XANES - from both the final state interference and DOS. But may be
experiments are showing the opposite, and that will prove me wrong.
Anatoly
________________________________
From: ifeffit-boun...@millenia.cars.aps.anl.gov
[ifeffit-boun...@millenia.cars.aps.anl.gov] on behalf of Matthew Marcus
[mamar...@lbl.gov]
Sent: Monday, October 10, 2011 2:23 PM
To: XAFS Analysis using Ifeffit
Subject: Re: [Ifeffit] lifetime broadening of pre-edge peaks?
Thanks. While none of these have to do with pre-edge peaks such as are found
in transition-metal oxides, the assumption of constancy of core-hole broadening
does seem to work.
mam
----- Original Message -----
From: Iztok Arčon<mailto:iztok.ar...@ung.si>
To: XAFS Analysis using Ifeffit<mailto:ifeffit@millenia.cars.aps.anl.gov>
Sent: Monday, October 10, 2011 12:32 AM
Subject: Re: [Ifeffit] lifetime broadening of pre-edge peaks?
Dear Matthew
you can find examples of determination of life-time broadening, deconvolution
of XANES specra, and discussion about limitations due to noise in several
papers, for example:
A. Filipponi, J. Phys. B 33, 2835 (2000)
A. Kodre, I. Arčon, J. Padeznik Gomilšek, R. Frahm
J. Phys. B: At. Mol. Opt. Phys. 35 (2002) 3497-3513
A. Kodre, J. Padežnik Gomilšek, A. Mihelič, I. Arcon
Radiation Physics and Chemistry 75 (2006) 188-194
J. Padeznik Gomilsek, I. Arcon, S. de Panfilis, A. Kodre,
Phys. Rev. A 79, (2009) 032514,
regards
Iztok
Matthew Marcus wrote:
Is the core-hole lifetime broadening of pre-edge XANES peaks the same as at the
main edge? I'm looking into issues of de-noising of XANES epsctra, so
need to figure out how narrow real features can be.
mam
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--
prof. dr. Iztok Arcon
University of Nova Gorica
Vipavska 13, POB 301
5001 Nova Gorica, Slovenia
tel: +386 5 331 5227
fax: +386 5 331 5240
e-mail: iztok.ar...@ung.si<mailto:iztok.ar...@ung.si>
http://www.ung.si/~arcon
http://www.ung.si/~arcon/xas
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