FEFF is an automated program for ab initio multiple scattering calculations of X-ray Absorption Fine Structure (XAFS) and X-ray Absorption Near-Edge Structure (XANES) spectra for clusters of atoms. The code yields scattering amplitudes and phases used in many modern XAFS analysis codes, as well as various other properties.

FEFF 8: The newest version is FEFF8 (Version 8.20). FEFF 8 improves over previous versions of FEFF by including self consistent calculation of potentials to provide charge transfer and a more accurate estimate of the Fermi level. It also includes full multiple scattering calculations to improve XANES calculations, where multiple scattering expansions can fail to converge. FEFF 8 can output the angular momentum projected density of states and FEFF 8.20 can also calculate x-ray emission spectra and x-ray scattering amplitudes.

FEFF 7: Relativistic version of FEFF 6 including polarization.

FEFF 6: High-order multiple-scattering EXAFS/XANES code.

ATOMS: Generates input files, feff.inp, for crystalline materials which are suitable for FEFF5 and higher (included with FEFF).

How to become an author of this FEFF Wiki Site

Due to SPAM accounts disturbing our wiki, anonymous accounts on the feff wiki have been blocked. For those interested in contributing to the wiki, please write request to John J. Rehr - jjr@phys.washington.edu with the account name you would like to use.

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