The surface structures of highly oriented pyrolithic material which had been bombarded with small doses of 215MeV Ne ions were investigated by means of scanning tunnelling microscopy. Three types of surface feature were found. These were those that had been produced by low-energy knock-on C atoms, those which had been produced by high-energy knock-on C atoms which emerged from the bombarded surface, and defects which were attributed to knock-on C atoms with an energy that was near to the maximum of electronic stopping and which moved in a direction that was approximately parallel to the bombarded surface. In some cases, atomic resolution of the observed surface features was achieved. Structures which could be attributed to the entry of the Ne ions themselves were not found.

L.P.Biró, J.Gyulai, K.Havancsák: Physical Review B, 1995, 52[3], 2047-53