Analysis of positron profiling data using e+DSc computer code

The Green's function method was applied to solve the one-dimensional positron diffusion equation for a system consisting of up to four layers that contain defects with different trapping rates. These allow us to obtain the analytical relationships valid for the evaluation of data obtained from variable energy positron measurements. They have been implemented in user-friendly free computer code available to users. Fitting strategies are presented to extract the relevant physical parameters. The code was used to determine positron diffusion length in samples of polycrystalline pure, well-annealed iron, depleted uranium, and titanium. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

The Green's function method was used to solve the one-dimensional positron diffusion equation for a system with defects of different trapping rates, up to four layers. Analytical relationships were obtained for evaluating data from variable energy positron measurements, implemented in user-friendly free computer code. Fitting strategies were presented for extracting relevant physical parameters, with the code used to determine positron diffusion length in various samples.