[Ifeffit] Vanadium pre edge peak contributes to K-space?
patridge at buffalo.edu
Tue Aug 25 10:44:38 CDT 2009
Bruce Ravel wrote:
> On Tuesday 25 August 2009 11:02:26 am Chris Patridge wrote:
>> Hello all,
>> After calibration, alignment and merging V K edge data, there seems to
>> be a large peak in R space below 1 A. From most examples and readings,
>> this would seem to be noise since atoms do not reside that close to each
>> other. Adding a background addresses this noise but then the number of
>> variables becomes too large and meaningless to the first shell R space
>> range. I believe the problem lies with the large pre edge feature seen
>> with high valence state Vanadium compounds. Any suggestions on how to
>> work through this and make realistic EXAFS analysis on these compounds.
>> Thanks everyone,
> Didn't Richard Mayes answer this same question from you last month?
> In my experience, Richard's answer was spot on for V K edge data.
> If Richard's good advice didn't help, then you need to be more
> explicit about what the problem is, perhaps by posting a small athena
> project file that demonstrates the problem.
Yes it is a very similar question. I did make this type of correction
by setting E0 myself. When moving to R space the data shows significant
intensity below 1 A which I thought was noise but it may not be. Are
these low A signals data or noise is my main concern because EXAFS
fitting does not fit all that well which then would point me to my model
as the problem which I think i understand.
Thank you all for your patience,
Christopher J. Patridge
SUNY Buffalo - Dept of Chemistry
716-645-6800 x 2110
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