Hi, all,

I am in studying the EXAFS of perovskite and clearly see the split of the first peak after ion irradiation. It should come from a symmetry change, so I use a tetragonal model (instead the original cubic) which contains two independent O sites. However, after running Atoms and Feff, all paths are contributed by only one O atom and nothing related to another Oxygen atoms (see attached file). As a result it may be difficult to get a good fit of the first split Ta-O peaks. I am not sure if it is true or something wrong.

Thank you very much  

Fuxiang Zhang