Z1-OSCILLATIONS IN THE STOPPING POWERS OF SILICON AND TUNGSTEN FOR LOW-VELOCITY CHANNELED HEAVY-IONS

A model of stopping for low-velocity heavy ions moving through an elec tron gas incorporating a shell model charge density has been used to c alculate the stopping powers of silicon and tungsten for ions channell ed along silicon [110] and tungsten [100] single crystals. The energy loss of the heavy ions is attributed to the scattering of target elect rons in the potential field of a moving projectile. So the stopping cr oss section is proportional to the momentum transfer (or transport) cr oss section. A comparison of the results with experimental data and ea rlier theoretical calculation shows good agreement. The present model is most suited to projectile velocities greater than the Fermi velocit y of target electrons.