XAS data processing and analysis using Ifeffit Bruce Ravel <bravel AT bnl DOT gov> An object oriented EXAFS data analysis system using Ifeffit Bruce Ravel <bravel AT bnl DOT gov> Class methods for X-ray absorption data of the elements Bruce Ravel <bravel AT bnl DOT gov> Class methods for X-ray scattering data of the elements Bruce Ravel <bravel AT bnl DOT gov> Enumerate elements in a chemical formula Bruce Ravel