Investigations On Interactions Of The Charged Particle With Nano-structured Materials

In the thesis, the interaction of the charged particle with nano-structured materials is studied, including nanosphere and an infinite metal slab with finite thickness in an infinite dielectric substrate. And we focus our attention on the spatial distribution of induced potential polarized by the fast ion in the metal slab and nanosphere, and the dependence of particle energy loss on physical parameters such as particle position, particle speed, metal slab thickness and so on.In chapter2, the interaction of a charged particle with a nanosphere is studied based on the dielectric response theory. We obtain the analytical expressions of the induced potential and stopping power, as the charged particle moving outside the nanosphere with a constant velocity. From our results, since the spherical shape limitation, the well-known V-shaped wake effect tracing the particle cannot be observed clearly no matter at the nanosphere surface or in the bulk. Besides, we also find that the particle can even gain energy from the electron polarization as the particle moves to the nanosphere at relatively low velocity.In chapter3, we consider a fast ion moving in an infinite metal slab with finite thickness in an infinite dielectric substrate. By means of the linearized quantum hydrodynamic (QHD) theory combined with Poisson’s equation in the appropriate boundary condition, the induced potential polarized by the fast ion in the metal slab and the electron stopping power of the ion are studied. From our calculation results, an oscillatory wake field appears apparently behind the particle at the both of the surfaces of the metal slab when the slab is thinner. Meanwhile, the oscillation near the surface gradually disappears and the oscillatory amplitude decreases with the increasing metal slab thickness. Finally, the dependence of the stopping power on the slab thickness, density parameter and damping factor are analyzed.