Abstract
Highly charged ions colliding with a solid have been predicted to produce localized Coulomb explosions on the surface. We have modeled the explosion using a large scale molecular dynamics simulation. Our results show the temporal evolution of three different types of craters which are formed when an incident highly charged ion produces 100 singly-charged Si atoms in various initial distributions on the surface. The total number of ejected particles ranges from 245 to 317 and appears to be determined by the initial shape of the ionized region rather than simply by the initial repulsive energy restored in the charged region. Contrary to intuition, a long and thin cylindrical distribution is the most efficient pattern for ejecting particles. In all three cases, the number of ejected neutral particles is much greater then the number of ejected ions (6–10 times as many atoms as ions). The angular distribution of ejected particles is also analyzed.
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