[Ifeffit] Dodgy Edge Steps
stefan.mangold at iss.fzk.de
Mon Apr 28 11:46:07 CDT 2008
the edge step should be less than 1; the edge step at white line
should be not higher than 1.5 and die maximum absorption should not be
higher than 2.7 (max. 3) (reason is the signal to noise ratio). The
reason for limiting the edge jump are none linearities of your
detector systems. So I would not use the data for further analysis.
Dr. Stefan Mangold
Institut für Synchrotronstrahlung
Am 28.04.2008 um 18:27 schrieb LACHLAN MACLEAN:
> Hi All
> Long-term lurker, first time poster.
> I've recently collected some EXAFS data with a large edge step
> (~3.4) and for some reason didn't pick up on it until it was too
> late. I've been told that ideally we would want an edge step of 1
> and anything above ~1.5-2 is too high. I'm wondering if there is a
> way to salvage the dataset in order to compare it with EXAFS data
> that I collected from two other samples (all three are supposed to
> be synthetic goethite). The first two samples that I want to
> compare have edge steps of about 0.35.
> I know Athena allows one to adjust the edge step but wonder how
> appropriate this is and how much change this would cause the EXAFS
> data? Trying to adjust the edge step from 3.4 down to ~1 or so
> seems to be quite a jump. I'm curious whether there is a way to
> salvage this data rather than wait until the next beamrun.
> Any help would be appreciated.
> Ifeffit mailing list
> Ifeffit at millenia.cars.aps.anl.gov
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