Fragmentation cross sections of fullerene cations have been measured as a function of collision energy under single collision conditions. The ions are produced by laser desorption from a C 60 /C 70 substrate. Collision products are analyzed with a linear time of flight mass spectrometer. The collision energy ranges from 5 eV up to more than 150 eV in the center of mass reference frame. A combination of molecular dynamics calculations and statistical RRKM theory has been applied to help understand the nature of the fragmentation dynamics. The results of collisions using different fullerenes as projectiles ͑C 56 ϩ , C 58 ϩ , C 60 ϩ , C 70 ϩ ͒ as well as collisions with a range of target gases ͑Ne, Ar, O 2 , CO 2 , ͑CH 2 ͒ 3 , C 3 H 6 , SF 6 ͒ give additional insight into the fragmentation mechanisms. The energy dependence of the fragmentation cross sections can be used to identify exothermic reactions between projectile and target as is shown for the case of molecular oxygen.
Collisions of C60+ and C70+ with SF6 were investigated in a time of flight mass spectrometer and compared with the results of collisions with Ar and Xe. Reaction cross sections were determined as a function of the center of mass collision energy between 25 and 300 eV. The influence of thermal excitation on fragmentation was examined. The effects of additional vibrational degrees of freedom in the case of SF6 on the fragmentation cross sections are discussed. Charge transfer reactions producing C602+ or C702+ were observed only with SF6. Thermal electron emission from highly excited C60− was used for the formation of an intense neutral C60 beam with 1 keV kinetic energy which was used to investigate charge transfer in neutral C60+SF6 collisions. Reaction products CnF+, n=1–11, were found in SF6 collisions.
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