THE SIMULATION OF ENERGETIC PARTICLE COLLISIONS WITH SOLIDS - A VISUAL REPRESENTATION

摘要

A set of animated sequences of various ion and cluster impacts on different material substrates are shown. The ion/target combinations used for these are: 25 keV Ar impact on Rh {100}, 500 eV B on Si{110} and C_(60) on graphite {0001}. Molecular Dynamics simulations using many body potentials are used throughout the calculations. Different aspects of both the collision process and simulation technique are demonstrated.1. The difference between individual ion impacts, in which a high sputtering event is contrasted with a low sputtering event.2. The propagation of energy in a collision cascade, in which it is observed that the high energy portion of the cascade propagates outwards while the inner portion loses energy.3. The number of collisions in a cascade which are non-binary in nature is shown to be significant and a number of five body interactions are found for quite energetic interactions.4. Implantation from the view point of the ion, in which two particles are followed, one channeling and one dechannelling. The dechannelling event leads to a focused collision sequence which is shown.5. The impact of a large cluster impact in which a large acoustic wave is seen to spread across the surface and evidence of a hypersonic energy transport mechanism prior to this.