Ps out diffusion — interconnectivity of pores

Both fo(E) and J(E) depend on the positron incident energy, E. Based on the one-dimensional out-diffusion model, the solution for the o-Ps out-diffusion probability is 

In this analysis, Eo,fmax,fre, and fi are obtained by fitting the experimental data. Ei fact, fitting is quite straightforward the decay as a function of E determines the diffusion length, fi, the increase region determines Eo, fmax is the saturation Ps yield and (fmax—ft) is determined by the surface Ps yield. Neither f— nor fre are affected by the profiles. The data for energy 3.0 keV 

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