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 > _______________________________________________> Ifeffit mailing list> Ifeffit@millenia.cars.aps.anl.gov> http://millenia.cars.aps.anl.gov/mailman/listinfo/ifeffit
블로그에 윈도우 라이브 메신저(베타)를 홍보하면 선물을 드립니다! http://windowslive.msn.co.kr/wlm/customer/view.asp?sectionDiv=2&seq=272