Hi all,

          I read the discussion on negative Debye waller factor. As per the discussion the negative value of this factor shows that the model has shortcomings, so it should be corrected.

         I am also getting the same problem while fitting one of my samples. It is a Cu complex whose EXAFS data is taken at Dispersive EXAFS beamline at RRCAT, Indore, India.

        In the complex the nearest neighbours of Copper atom are Nitrogen and Oxygen.

        I am getting a very good fit upto 3rd shell but the problem is that all ss parameters are coming negative. I checked the model it seem correct.

        Also I am getting a peak below 1 Angs which is also getting fitted but I am not able to get that whether it is a real or due to some noise.

        I am attaching herewith the results of data analysis and fitting.

        Thanks in advance

        With regards

     Abhijeet Gaur

Vikram University

Ujjain, INDIA