COMPARISON OF 3 PROGRAMS - POSITRONFIT, RESOLUTION AND LT USED FOR DECONVOLUTION OF POSITRON LIFETIME SPECTRA

Computer simulations of positron lifetime spectra for copper containin g thermally generated vacancies have been carried out in order to comp are the effectiveness of three fitting programs: Positronfit, Resoluti on and a new one LT used for deconvolution of the spectra. The compari son has shown that the deconvolution of the spectra using the LT progr am gives better results. Deviation of the resolution function from the input one leads to a nonlinear temperature dependence of the calculat ed bulk lifetime in the vacancy region. So, the authors believe that t he 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.