Multifragmentation of C-60 by fast Li-0 atoms and Li1-3+ ions in electron loss and capture collisions - art. no. 012702

Fragmentation and ionization of C-60 are studied for electron capture and l oss collisions of fast Liq+ (q = 0-3) projectiles at a velocity upsilon = 3 .38 a.u. Production cross sections are measured for all observed ions by a time-of-flight method in coincidence with outgoing projectile charge states k. Multifragmentation as well as multiple ionization are observed strongly even for the neutral projectiles. Total production cross sections, summed over all observed ions? are found to be the same order of magnitude for q l ess than or equal to 2, indicating that the fragmentation is induced in clo se collisions, i.e., by penetration of the incident particles through the C 60 cage. Also, it is found that the total fragmentation cross sections as a function of k show nearly the same shape as the equilibrium charge state d istributions (CSD) measured for other condensed materials. This certainly i mplies that a memory for the initial charge state q is nearly lost while pe netrating the cage, and the final CSD is approximately equilibrated.