Ion Beam Interaction With Nanostructures

We have performed a series of measurements of negative ions through Al2O3nanocapillaries. We found the negative ions are transmitted rather than guided through the Al2O3nanocapillaries. There are two components of transmission:a, the scattered ions with their charge changed, peaked around the axis of capillaries; b, the direct transmitted beam without charge exchange, peaked around the incident direction, coming from the portion of nanocapillaries aligned to the beam direction. In order to understand these results quantitatively, we developed a Monte Carlo code in Geant4, which is a popular simulation tool for the passage of particles through matter, widely used in high energy, nuclear and accelerator physics and applied to the medical and space science.Muscovite mica sheets were bombarded by lithium, carbon and oxygen ions in the energy range from several hundred keV to several MeV. The induced surface structures were measured in the air with Atomic Force Microscopy (AFM) in the tapping mode. The hillock-like structure on the mica surface was observed. The height of the hillock increases linearly when the energy loss is above1.2keV/nm. The induced structures are similar with the similar electronic stopping powers but different projectiles for muscovite mica.