Hello mzhu

I think that it is impossible to distinguish nitrogen with oxygen by using EXAFS. I would like to recommend XANES for your study.
The shift of pre-edge of XANES shows how the oxidation state of metal is changed.
As you know, If there are nitrogen atoms in substitute for oxygen atoms around metal, the pre-edge of metal xanes may shift to high energy because the oxidation state increases.

> From: mzhu@udel.edu
> To: ifeffit@millenia.cars.aps.anl.gov
> Date: Fri, 19 Dec 2008 16:20:39 -0500
> Subject: [Ifeffit] How to identify N and O atoms in the first coordinate
>
> Hello all,
> Merry Christmas!
> I have some samples of heavy metal sorption on bacterial biofilm. I want to figure out what elements are coordinated with the heavy metal in the first coordinate. Since the oxygen and nitrogen have similar scattering factors, how can I differetiate them? Using shell-by-shell fitting or linear combination fitting with standards? Thanks.
>
> Best wishes,
>
> Mengqiang Zhu
>
>
>
>
>
>
>
> -----------------------
> Mengqiang Zhu
> Ph.D Candidate
> Environmental Soil Chemistry
> Department of Plant and Soil Sciences
> University of Delaware
> 152 Townsend Hall
> Newark, DE 19716
> ! http://ag.udel.edu/soilchem/zhu.html
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