PALSfit

PALSfit is a computer program for analysing spectra that are measured by positron annihilation lifetime spectroscopy (PALS). PALSfit is based on the well tested PATFIT program, which has been used extensively by the positron annihilation community. Taking advantage of the windows interface, a number of new user friendly facilities have been incorporated, in particular graphics displays.

PALSfit is composed of two modules for fitting of positron lifetime spectra, PositronFit and ResolutionFit. In both modules a model function will be fitted to a measured lifetime spectrum. The model function consists of a sum of decaying exponentials convoluted with a resolution function, plus a constant background. The time resolution function is described by a sum of Gaussians which may be displaced with respect to each other. Various types of constraints may be imposed on the fitting parameters.

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