[Ifeffit] Vanadium pre edge peak contributes to K-space?

[Chris Patridge]

Richard Mayes wrote:
> Chris,
>  
> You'll answer this question when you post a project file; but since 
> you mention the pre-edge feature, have you reset the Eo to approx. 
> halfway up the absorption edge instead of on the pre-edge feature itself?
>  
> -Richard
>
> On Tue, Aug 25, 2009 at 11:10 AM, Carlo Segre <segre at iit.edu 
> <mailto:segre at iit.edu>> wrote:
>
>
>     Hi Chris:
>
>     If you could attach an Athena project file, it would help us to answer
>     your question.
>
>     Carlo
>
>     On Tue, 25 Aug 2009, 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,
>     >
>     >
>
>     --
>     Carlo U. Segre -- Professor of Physics
>     Associate Dean for Graduate Admissions, Graduate College
>     Illinois Institute of Technology
>     Voice: 312.567.3498            Fax: 312.567.3494
>     segre at iit.edu <mailto:segre at iit.edu>   http://www.iit.edu/~segre
>     <http://www.iit.edu/%7Esegre>   segre at debian.org
>     <mailto:segre at debian.org>
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>   
I did set the E0 past the edge feature approximately halfway up and then 
set that E0 to all before merging.  I included a merge project file of V 
compound.  Thank you.

-- 
Christopher J. Patridge
Graduate Student
SUNY Buffalo - Dept of Chemistry
716-645-6800 x 2110
315-529-0501

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