Hi Alan: I believe that the macros are useful only when using Ifeffit directly, not from Athena. I have solved the problem by writing a short Python program which will convert either of the two file formats and make a new file which can be read in by Athena. I have attached the python program to this message if you wish to use it. If you have specific files that you need translated, tell me which ones and I can do it for you if you like. carlo On Thu, 9 Dec 2010, Alan Du wrote:

Hi IFEFFIT Users,

I major in environmental science and my research is studying the adsorption of aqueous cadmium on TiO2 solid. I am new to EXAFS and currently trying to fit my Cd K-edge spectra with some Cd experimental standards.

The Farrel Lytle Database have some Cd spectra which seems useful and I would like to extract them from their "raw" state. The macro is given in the FAQ/Data Handling section of IFEFFIT, but I am not sure of how to go about using the macro or any other macro. Ctrl 5 in Athena is all I know. Can anyone advise me on this?

# macro lytle file group 4000

read_data ($1, group=$2, label='steps i0 i1 i2') set (dspace = 1.92017, stpdeg = $3) set (r2d = 57.29577951, hc = 12398.61) set $2.energy = hc / (2 * dspace) / sin($2.steps / (r2d * stpdeg)) set $2.xmut = -log($2.i1/$2.i0) set $2.xmuf = ($2.i2/$2.i0) pre_edge $2.energy, $2.xmut

end macro

Cheers,

Alan

-- Carlo U. Segre -- Professor of Physics Associate Dean for Graduate Admissions, Graduate College Illinois Institute of Technology Voice: 312.567.3498 Fax: 312.567.3494 segre@iit.edu http://www.iit.edu/~segre segre@debian.org