On Monday 25 August 2008 11:23:49 Hashem Stietiya wrote:
Dear Dr. Ravel,
I am trying to optimize background removal of my spectra by setting the Rbkg to half the distance of the first shell peak. However, when I import my spectra in ATHENA, I notice that the edge step is a very large number and when converting to R space there are no well defined peaks. If I click on 'fix step', the R space becomes comprehendible and peaks appear. Do I continue using the 'fix step' and then setting Rbkg to half the distance of the first shell peak?
I agree with Scott. The most likely problem is that either the pre-edge or post-edge line (or both) is computed wrongly. Here is the documenta page on normalization: http://cars9.uchicago.edu/~ravel/software/doc/Athena/html/bkg/norm.html B -- Bruce Ravel ------------------------------------ bravel@bnl.gov National Institute of Standards and Technology Synchrotron Methods Group at NSLS --- Beamlines U7A, X24A, X23A2 Building 535A Upton NY, 11973 My homepage: http://xafs.org/BruceRavel EXAFS software: http://cars9.uchicago.edu/~ravel/software/exafs/