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@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@iit.edu   http://www.iit.edu/~segre   segre@debian.org

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Christopher J. Patridge
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