Molecular dynamics simulation of cluster-ion fragmentation
Recent experiments have shown that it is possible to "bounce" low energy (few eV/atom) molecular ions from surfaces and observe the inelasticity of the rebound and the fragmentation patterns. In order to understand these data and to improve our intuition of such phenomena, we have performed molecular dynamics simulations of the impacts of Au clusters with barriers. These calculations not only allow us to deal with laboratory experiments but also give insight into the collisions of interstellar grains that result from the propagation of supernova-driven shock fronts through molecular clouds. In this case we want to determine to what extent the grains are heated and fragmented as a function of the shock velocity. The relevance of these results to the application of cluster-ion bombardment in thin-film deposition will also be discussed.
© 1994 Elsevier Science B.V. Supported in part by the National Aeronautics and Space Administration [Grant NAGW-2279) at Caltech and the National Science Foundation [Grant DMR90-02532) at California State University, Fullerton. We wish to thank the California Institute of Technology for its support and encouragement of the Ph11 Research Tutorial program that has made possible the participation of Caltech undergraduates JDW, RTF, and SSV.