Stopping forces of 3He and 6Li ions with MeV energies in polycarbonate, polyethylene terephthalate, and polypropylene foils

In this study, stopping forces of 1.1–4.5 MeV 3He ions and 1.2–4.8 MeV 6Li ions impinging in foils of polycarbonate, polyethylene terephthalate, and polypropylene are measured by means of a transmission technique using a half-covered detector. The results appear to be in agreement with those obtained from the semi-empirical calculations and experiments by others. The validity of Bragg’s additivity rule is discussed for these ions in the polymers.