COORDINATION-NUMBER DEFECTS AND RING FORMULATION OF FULLERENE-LIKE CLUSTERS PRODUCED BY C-60-C-60 COLLISION

Defect structures of fullerenes and fullerenelike clusters produced by two C-60 molecules colliding at differ ent impact parameters and diff erent collision directions in the energy range 50-600 eV have been stu died using a molecular-dynamics simulation method. The electronic stru ctures around the defects are obtained using a self-consistent-field H artree-Fock scheme. The results show that the numbers of coordination- number defects obey a magic rule, and the numbers of rings forming the closed cage structure of the fullerene or fullerenelike products can be well described by a modified formula deduced from Euler's theorem. The electronic structures around the defects are substantially changed in comparison with those of the carbon atoms on normal fullerene cage s.