The electronic stopping power of hydrogen beams penetrating He gas has been calculated by solving the time-dependent Schrõdinger 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.
Physical review. A, Atomic, molecular, and optical physics. New York. Vol. 47, n. 2 (Feb. 1993), p. 1119-1122