On Friday 14 July 2006 03:03, you wrote:
I'm using Athena for fitting my EXAFS data. I have a problem: I need the phase shift corrections for Ni as a function of the photon energy in the range (38-44) keV. In fact, I'm studying the La K edge in LaNi_5 and so I have to put the phase correction relative to the Ni-La scattering. May you help me, please? Thank you and excuse me.
Antonio, This is the sort of question that you should consider asking on the ifeffit mailing list. That way, when I'm out of town, as I was last week, someone else might be able to answer your question. http://cars9.uchicago.edu/mailman/listinfo/ifeffit/ I believe that the thing you are looking for is answered in the documentation for both Ifeffit and Feff. Here is a link from the Feff6 document that explains what the columns are in a feffNNNN.dat file: http://feff.phys.washington.edu/feff/Docs/feff/feff6-6.html#ss6.7 The language in that document is a bit cryptic, but you can see that the third and fourth columns of that file are the magnitude and phase of the effective scattering function for the path. Here is a link where Ifeffit explains what happens you you directly read a feffNNNN.dat file: http://cars9.uchicago.edu/~ifeffit/refman/node24.html Again, we see that the third and fourth columns of the file contain the magnitude and phase of the effective scattering function. So it would seem, by my understanding of your question, that you need to find the feffNNNN.dat file for the scatterer you are interested in and use the fourth column of that file. HTH, B -- Bruce Ravel ---------------------------------------------- bravel@anl.gov Molecular Environmental Science Group, Building 203, Room E-165 MRCAT, Sector 10, Advanced Photon Source, Building 433, Room B007 Argonne National Laboratory phone and voice mail: (1) 630 252 5033 Argonne IL 60439, USA fax: (1) 630 252 9793 My homepage: http://cars9.uchicago.edu/~ravel EXAFS software: http://cars9.uchicago.edu/~ravel/software/exafs/