Analysis of Ionic Fragment Size Distribution in Collision of Nanosecond Laser with the C60 Molecule

At the critical point of fragmentation phase transition occurring in C-60 system, we found that the yield distribution of ionic fragments C-n(+) (n=3-16) originating from the multi-fragmentation pattern can be approximated fairly well by a power-law attenuation form of n(-lambda). Under the framework of Fisher model, the experimental result implies that the ionization-degree distribution of fragments obeys a power law enhancement form as the size n.