PUB - Publikationen an der Universität Bielefeld

We studied the fragmentation Of C-60 molecules in collisions with slow Ar+ ions (v approximate to 0.04-0.55 au) and with Arz+ ions (z = 2, 3) at somewhat higher ions velocities (v approximate to 0.3-0.95 au). The measured mass spectra show C-60(q+) (q less than or equal to 5), smaller C-60-2m(q+) fullerenes and C-60-2m(q+). + C-n(+) fission products. Special attention is devoted to the C-60 multi-fragmentation process, i.e. the breakup.of the C-60 cage into several small C-n(+) fragments (n = 1-29). Up to seven correlated small Q fragments (n = 1-5) have been observed. The muld-fragmentation pattern depends on the projectile charge. Furthermore, it varies strongly with the projectile velocity for slow ions, whereas it becomes nearly constant for faster ions. This is in accordance with recent non-adiabatic quantum molecular dynamic calculations.