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A study has been conducted into the mechanisms of evolution of clusters andtheir subsequent fragmentation under energetic heavy ion bombardment ofamorphous graphite. The evolving clusters and their subsequent fragmentationunder continuing ion bombardment are revealed by detecting various clusters inthe energy spectra of the Direct Recoils emitted as a result of collisionsbetween ions and surface constituents. The successive Direct Recoil spectrareveal that the energetics of Carbon Carbon bond formation as well as anysubsequent fragmentation can be related to the processes of energy dissipationin a cylindrical volume of a few Angstrom surrounding the ion path. Thedependence of cluster with m carbon atoms formation or its subsequentfragmentation into cluster with m-2 carbon atoms and diatomic carbon C2 is seento be a function of the ionic stopping powers in this cylindrical volume.

Evolution of clusters in energetic heavy ion bombarded amorphous graphite-II: formation and fragmentation phenomena