z1oscillations in the stopping powers of silicon and tungsten for low-velocity channelled heavy ions

A model of stopping for low-velocity heavy ions moving through an electron gas incorporating a shell model charge density has been used to calculate the stopping powers of silicon and tungsten for ions channelled along silicon (110) and tungsten (100) single crystals. The energy loss of the heavy ions is attributed to the scattering of target electrons in the potential field of a moving projectile. So the stopping cross section is proportional to the momentum transfer (or transport) cross section. A comparison of the results with experimental data and earlier theoretical calculation shows good agreement. The present model is most suited to projectile velocities greater than the Fermi velocity of target electrons.