Evaluation of the factor in the study of dynamical properties of hyperfine interactions

The interpretation of Mössbauer spectra often requires the use of the Transmission Integral function (TI). It contains the quantity , where f_s is the source Mössbauer factor and B depends on the background radiation rate and on the inhomogeneity of the target: both of them usually obtained by ancillary measurements and tests. We present a simple method, that avoids ancillary measurements in evaluating the quantity . It is useful when the Mössbauer line-shape rapidly evolves in narrow temperature ranges: a real application for single molecule magnets spectra and an analytical example are reported, too