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Program package CONFIT enables a complex processing of 57 Fe and 119m Sn Mössbauer 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 Mössbauer spectra taken in the transmission and in the back-scattering geometry (including g-ray and conversion electrons) and it can be successfully applied for analyzing the emission Mössbauer spectra. The transmission Mössbauer spectra yield information concerning the bulk microstructure, the backscattering geometry is used for surface studies and the emission Mössbauer spectra yield information from grain boundaries or interface regions. The CONFIT is user friendly, fast and applicable for complicated Mössbauer spectra.

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