CONFIT: Mössbauer spectra fitting program

Abstract

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.

Magnetic Properties of Ion Irradiated Fe_{75}Mo_{8}Cu_{1}B_{16} Metallic Glass

“…Surface regions were probed by conversion electron (CEMS) and conversion X-rays (CXMS) Mössbauer spectrometry to the depth of ∼ 200 nm and ∼ 5 µm, respectively. The obtained spectra were analyzed using the Confit evaluation program [5]. Thermomagnetic characteristics were recorded by Quantum Design VersaLab system in the temperature range 50-400 K and maximum magnetic field up to 1 T.…”

Surface Features of Nanocrystalline Alloys

“…Evaluation of the spectra was accomplished by the Confit software. [9] Spectral parameters were refined using a fitting model that assumed presence of nanocrystalline grains embedded in a residual amorphous matrix. Details on the concept of this model can be found elsewhere.…”

Mössbauer study of Fe phases in terrestrial olivine basalts from southern Egypt

“…Mössbauer spectra were obtained for all three aliquots at room temperature (297 K) and also at liquid nitrogen temperature (77 K) for S1 WR . Hyperfine parameters of the spectra including spectral area (RA), isomer shift (), quadrupole splitting (ΔE Q ), line width (Γ), and hyperfine magnetic field (H) were refined using the CONFIT fitting software of Žák and Jirásková (2006). Accuracies are 1 % for RA, 0.02 mm/s for , ΔE Q and Γ, and 0.5 T for H. All  values are relative to metallic iron.…”