On Wednesday 21 January 2004 04:05 pm, Tamas Varga wrote:
1. What's the exact definition of the R-factor used to evaluate the fractional misfit?
Read Chapter 5 of this document: http://cars9.uchicago.edu/feffit/feffit.ps It's the old feffit manual, but the definitions of chi-square and R-factor are the same.
2. Can Artemis fit just Fourier filtered raw data in k-space?
If I understand your question, then, yes. On the data page in Artemis there is a drop-down menu labeled "Fitting space". One of the options is "q". In ifeffit-speak "q-space" means "Fourier filtered k-space". We had to call it something.... ;-) If I recall correctly, the back transform will be done over the R-range and the fit will be done over the k-range of the original FT. B -- Bruce Ravel ----------------------------------- ravel@phys.washington.edu Code 6134, Building 3, Room 222 Naval Research Laboratory phone: (1) 202 767 5947 Washington DC 20375, USA fax: (1) 202 767 1697 NRL Synchrotron Radiation Consortium (NRL-SRC) Beamlines X11a, X11b, X23b National Synchrotron Light Source Brookhaven National Laboratory, Upton, NY 11973 My homepage: http://feff.phys.washington.edu/~ravel EXAFS software: http://feff.phys.washington.edu/~ravel/software/exafs/