Dear Dr Carlo
The edges are almost identical. The pre-edge intensity change isn't that significant I feel. I did the Artemis fittings with the coordination numbers fixed. Maybe I can try varying the coordination numbers and see if it gives a different result.
I have attached the images of the pre-edge and main peak.
Hi Disha:
it would be good to see the XANES you are referring to. Are the edges
identical or do they change but not shift significantly? Is the
coordination number also constant? Generally, the bond distance will
change with oxidation state if the coordination number is constant but if
the coordination number changes, then there could be a change in bond
length too.
Cheers,
Carlo
On Mon, 11 Jun 2018, Disha Gupta wrote:
> Dear All
>
> Firstly, I would like to say sorry if I have missed out on this discussion
> before but it would be great if you could help me out.
> I have been analyzing some Mn K-edge XAS data for some battery materials.
> While the XANES data shows no shift in the main absorption peak which means
> that there is no oxidation change happening, however, when I am fitting the
> data in Artemis, I can see a shift in the bond lengths suggesting an
> oxidation change. Is it possible that bond lengths change even though XANES
> spectra show no change?
>
>
> Thank you and Kind Regards
> Disha
>
Carlo U. Segre -- Duchossois Leadership Professor of Physics
Interim Chair, Department of Chemistry
Director, Center for Synchrotron Radiation Research and Instrumentation
Illinois Institute of Technology
Voice: 312.567.3498 Fax: 312.567.3494
segre@iit.edu http://phys.iit.edu/~segre segre@debian.org
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