Study of defect structure with new software for numerical analysis of PAL spectra

Abstract

The positron trapping model is implemented into the code of LT 9-2 version of LT software. This allows to search directly for the positron trapping parameters of lifetime spectra relating to samples containing defects of vacancy type. The method of analysis, together with the possibility of simultaneous analysis of many lifetime spectra, enables one to reduce, in comparison with the conventional way of analysis, the number of free parameters used by the fitting procedure. LT 9-2 is employed to analyze artificial spectra simulated according to 2-and 3-state trapping model and the results are discussed with regard to the spectrum statistics and the way in which the calculation process is conducted.