[Ifeffit] too small bond length in R space

Patridge, Christopher patridgc at dyc.edu
Sun Nov 9 01:21:31 CST 2014

That is a difficult problem. You might consider using the structural model as a guide for setting the background r max by comparing the data and model if you are confident that the model is close to the sample you are studying.
Good luck.

Chris Patridge 

> On Nov 9, 2014, at 6:54 AM, ZHAN Fei <zhanfei at ihep.ac.cn> wrote:
> Dear all:
>   I encounter a problem of exafs fit in an example of Mo which have Mo-O Mo-S Mo-Mo bond.The problem is that the Mo-O peak in R space has too small bond length (less than 1.4A(+0.5A for phase correction) ).Because when 1.2>rbkg>0.68 there is little change in spectrum of R and k space,and when I increase the value of rmin of forward Fourier transform the peak changes little,so I think it's not a noise.But when I try to fit it use the 1.35A path of Mo-O,I can't fit it well.
> Could you give me some advise about fit too small bond length,or recommend papers of similar situation?
> picture of R space is attached.
> Thanks
> Sincerely,
> zhanfei
> ihep of China
> <R space.png>
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