The fragment ion distribution of C-60 in close collision with fast carbon ions

We have measured the mass distribution of fragment ions of C-60 produced by collisions with 15.6 MeV carbon ions in different charge states. Close collisions were selectively measured using the coincidence method with the change of the projectile charge state. For the electron capture and loss by C5+.6+ projectile ions, which are the K-electron processes, the multifragmentation was observed evidently. In L-electron loss channels of the C2+ projectile, the peaks of the multiply ionized C-60 ions and the multiply ionized fullerene-like fragment ions are more intense or as intense as the small fragment ions. We suppose that we can roughly classify the intermediate states of C-60 through the measurement of fragmentation in coincidence with the change of charge state for various projectiles.