CONFIT:: Mossbauer spectra fitting program

Program package CONFIT enables a complex processing of Fe-57 and Sn-119 Mossbauer spectra. The mouse drag-and-drop technique is used to set up the background and parameters of the individual spectral components according to the structural model supposed. An original method has been applied: a nonlinear least-squares procedure with the Fast Fourier Transform (FFT) technique. A combination with improved matrix formalism can create various physical models to analyze the measured experimental data in a proper way. The hyperfine field distribution(s) and also quadrupole splitting distribution(s) with Gaussian profile can be applied, besides discrete components. The finite sample thickness can be included in terms of transmission integral and a dependence of the spectral line-width on its position with respect to the spectrum center is described by an additional parameter. This fitting procedure is suitable for Mossbauer spectra taken in the transmission and in the back-scattering geometry (including gamma-ray and conversion electrons) and it can be successfully applied for analyzing the emission Mossbauer spectra. The transmission Mossbauer spectra yield information concerning the bulk microstructure, the back-scattering geometry is used for surface studies and the emission Mossbauer spectra yield information from grain boundaries or interface regions. The CONFIT is user friendly, fast and applicable for complicated Mossbauer spectra. Copyright (C) 2006 John Wiley & Sons, Ltd.