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Absolute charge transfer and fragmentation cross sections in $\color{red}He_2^+ - C_{60}$ collisions

We 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 only important at impact energies larger than 40 keV ; at lower energies, sequential C2 evaporation is the dominant process.

Voir en ligne : Phys. Rev. Lett. 100, 183401 (2008)