Giant Barkas effect observed for light ions channeling in Si
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Data
2001Autor
Abstract
Measurements of the electronic energy loss are presented for ⁴He and ⁷Li ions channeling along the Si main axial directions at intermediate to high projectile energies. The Barkas effect, an energy-loss enhancement proportional to the third power of the projectile charge at high energies, is clearly separated from other processes. It reaches about 50% for Li ions channeling along the Si <110> direction. The observed Barkas contribution from the valence-electron gas is in fair agreement with the
Measurements of the electronic energy loss are presented for ⁴He and ⁷Li ions channeling along the Si main axial directions at intermediate to high projectile energies. The Barkas effect, an energy-loss enhancement proportional to the third power of the projectile charge at high energies, is clearly separated from other processes. It reaches about 50% for Li ions channeling along the Si <110> direction. The observed Barkas contribution from the valence-electron gas is in fair agreement with the Lindhard model.
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