Absolute Charge Transfer and Fragmentation Cross Sections in He2+ -C60 Collisions

Abstract

International audienceWe have determined absolute charge transfer and fragmentation cross sections in He2 C60 collisions in the impact-energy range 0.1-250 keV by using a combined experimental and theoretical approach. We have found that the cross sections for the formation of He and He0 are comparable in magnitude, which cannot be explained by the sole contribution of pure single and double electron capture but also by contribution of transfer-ionization processes that are important even at low impact energies. The results show that multifragmentation is important only at impact energies larger than 40 keV; at lower energies, sequential C2 evaporation is the dominant process