Coincidence Experiments Concerning Convoy-Electron Production by 1 - 8.5 MeV/u Highly Ionized Projectiles Traversing Polycrystalline Solids and Axial Channels in Gold

Abstract

Convoy electrons produced by 1-8.5 MeV/u ${\mathrm{O}}^{{q}^{+}}$ ions traversing polycrystalline C, Al, and Au targets and $〈110〉$ and $〈100〉$ axial channels in Au are detected in coincidence with emergent ions of charge state ${q}_{e}$. The yield integrated over electron velocity for channeled ions depends strongly on ${q}_{e}$, but the shape is found to be independent of ${q}_{e}$, $v$, and target material. For polycrystalline and randomly oriented monocrystalline targets, the yield is found to be independent of emergent-ion charge state ${q}_{e}$. The data suggest that convoy-electron production is a bulk process.