Model of charge transfer collisions between C₆₀ and slow ions

A semiclassical model describing the charge transfer collisions of C₆₀ fullerene with different slow ions has been developed to analyze available observations. These data reveal multiple Breit-Wigner-like peaks in the cross sections, with subsequent peaks of reactive cross sections decreasing in magnitude. Calculations of charge transfer probabilities, quasi-resonant cross sections, and cross sections for reactive collisions have been performed using semiempirical interaction potentials between fullerenes and ion projectiles. All computations have been carried out with realistic wave functions for C₆₀'s valence electrons derived from the simplified jellium model. The quality of these electron wave functions has been successfully verified by comparing theoretical calculations and experimental data on the small angle cross sections of resonant C₆₀+C₆₀ ⁺ collisions. Using the semiempirical potentials to describe resonant scattering phenomena in C₆₀ collisions with ions and Landau-Zener charge transfer theory, we calculated theoretical cross sections for various C₆₀ charge transfer and fragmentation reactions which agree with experiments.