  We report on a novel technique of heavy ion induced surface modification and
clustering mechanisms in amorphous graphite using Direct Recoil Spectrometry.
The charged clusters emanating as Direct Recoils from 50-150 keV Xe+ irradiated
graphite surface are detected in successive energy spectra at large recoil
angles. Ion beams irradiated surface is shown to provide an environment of
sputtered carbon atoms and clusters. The clustering occurs on the surface where
the most stable ones accumulate. The spectra have identified clustering
mechanisms operating in amorphous graphite under high fluence irradiations at
grazing incidence that are related to the reconstructed surface features. Heavy
ion irradiation induces the twin effects of producing a wide range of clusters
and simultaneously ejecting these as DRs.
