A new method to measure the velocity dependence of electronic stopping for low velocity hydrogen projectiles

Abstract

We propose a new method by which the velocity dependence of the electronic stopping cross section for low energy projectiles can be determined accurately. The measurement is done in backscattering geometry and needs a high resolution detector; we intend to use an existing time-of-flight assembly with a resolution of T ΔT ≈ 500 . The basic idea is that corrections due to plural and multiple scattering can be avoided by using protons and deuterons of equal energy, since they follow the same multiple scattering distribution. Using the Monte-Carlo code TRBS, we have simulated the energy spectra of 7 keV protons and 7 keV deuterons backscattered from 6.7 μg/cm 2 Cu. Our evaluation procedure applied to the simulated spectra yields good agreement with the input data.