Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evolution of clusters in energetic heavy ion bombarded amorphous
  graphite-II: formation and fragmentation phenomena   A study has been conducted into the mechanisms of evolution of clusters and
their subsequent fragmentation under energetic heavy ion bombardment of
amorphous graphite. The evolving clusters and their subsequent fragmentation
under continuing ion bombardment are revealed by detecting various clusters in
the energy spectra of the Direct Recoils emitted as a result of collisions
between ions and surface constituents. The successive Direct Recoil spectra
reveal that the energetics of Carbon Carbon bond formation as well as any
subsequent fragmentation can be related to the processes of energy dissipation
in a cylindrical volume of a few Angstrom surrounding the ion path. The
dependence of cluster with m carbon atoms formation or its subsequent
fragmentation into cluster with m-2 carbon atoms and diatomic carbon C2 is seen
to be a function of the ionic stopping powers in this cylindrical volume.

28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
18
The categories of this paper are: econ
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga