The electronic stopping power of hydrogen beams penetrating He gas has been calculated by solving the time-dependent Schr\"odinger equation. Special attention has been given to low incident energies where capture and loss of the projectile electron are the most important energy-loss mechanisms. These mechanisms are included in a consistent theoretical treatment and good agreement with experimental data has been obtained for high- as well as for low-energy projectiles in a gas target.
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Grande et al. (1993) studied this question.
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