Evolution of clusters in energetic heavy ion bombarded amorphous   graphite
  Carbon clusters have been generated by a novel technique of energetic heavy ion bombardment of amorphous graphite. The evolution of clusters and their subsequent fragmentation under continuing ion bombardment is revealed by detecting various clusters in the energy spectra of the direct recoils emitted as a result of collision between ions and the surface constituents. 
M.N. Akhtar, Bashir Ahmad and Shoaib Ahmad
physics.atm-clus cond-mat.mes-hall