Emission of singly and doubly charged light fragments from C60r+ (r=4-9) in Xe25+-C60 collisions -: art. no. 063201

Asymmetrical fission of C-60(r+) (r=4-9) ions are studied in Xe25+-C-60 collisions at 100 keV impact energy (vapproximate to0.18 a.u.). The branching ratios for the emission of a singly or a doubly charged light fragment, C-m(+) or C-m(2+), are measured for each initial charge state r. The measured m-dependent branching ratios for the singly charged C-m(+) fragment emission channels are reproduced using. a simple statistical model. The ionization energies I(C-60-2n(q+)) for even numbered fullerenes C-60-2n(q+) (q = 1-5, 8; n = 1-4) and I(C-2n(+)) for singly charged light fragments C-2n(+) (n = 1-4) are estimated by the density-functional theory. The total branching ratio for the C-m(2+) emission channels is found to increase from less than 2 to 25% when the charge r of the parent ion C-60(r+) increases from 5 to 9.