Comparison of three programs: Positronfit, Resolution and LT used for deconvolution of positron lifetime spectra

Computer simulations of positron lifetime spectra for copper containing thermally generated vacancies have been carried out in order to compare the effectiveness of three fitting programs: Positronfit, Resolution and a new one LT used for deconvolution of the spectra. The comparison has shown that the deconvolution of the spectra using the LT program gives better results. Deviation of the resolution function from the input one leads to a nonlinear temperature dependence of the calculated bulk lifetime in the vacancy region. So, the authors believe that the nonlinear dependence observed sometimes in the experiment may be an artifact of the fitting procedure, caused by an underestimate of the full width at half maximum (FWHM) of the resolution function.