Molecular dynamics simulations of various sizes of carbon molecule as clusters impacting a carbon substrate are performed in order to examine the size-dependence of the cluster ion on the impact process. Highly Oriented Pyrolitic Graphite (HOPG) was irradiated with C1, C4, C8, C19 and C60 clusters carrying the same energy-per-atom of 2 keV/ atom. When the cluster size is less than eight, interspersed damage is formed by the cascade-collision mechanism, whereas C19 and C60 impacts show homogeneously damaged regions in the surface of the substrate. In the case of large cluster ion impacts, all the incident energy of a cluster is deposited with high density in narrow region on the surface. These results show good agreement with experimental STM observations of single traces induced by the impact of C60 and small carbon molecules.
|Number of pages||6|
|Journal||Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms|
|Publication status||Published - Jun 1999|
|Event||Proceedings of the 1998 4th International Conference on Computer Simulation of Radiation Effects in Solids (COSIRES) - Okayama, Jpn|
Duration: Sep 15 1998 → Sep 19 1998
ASJC Scopus subject areas
- Nuclear and High Energy Physics