Charge transfer collisions between fullerenes: C3+60 + C60

Abstract

Charge transfer collisions between C 3+ 60 and C 60 are studied for collision energies between 400 and 3600 eV. Single and double electron transfers are observed, both occuring under single collision conditions. Absolute charge transfer cross sections are determined as a function of collision energy. The cross section for single electron capture of approx. 300Å 2 is about two times larger than that for double electron transfer. For both processes the cross section increases slightly with increasing collision energy.

Resonant and non-resonant charge transfer in and collisions

“…The experimental set-up has been described before (Rohmund et al 1996b, Rohmund andCampbell 1997) so we shall only give a brief outline of it here. The method we use to investigate cluster-cluster collisions is the time-of-flight technique.…”

“…C 60 of high purity (>99.4%) is evaporated inside the scattering cell which has a length of 2 cm. The vapour pressure inside the cell is kept sufficiently low to ensure single collision conditions between primary and target fullerenes (Rohmund and Campbell 1997). Unscattered primary ions and reaction products leave the scattering cell through a 4 mm wide aperture which is identical to the entrance aperture and pass a second field-free region before they are detected by a pair of multichannel plates.…”

“…We have previously presented the collision energy dependence of absolute cross sections for the single-and double-electron transfer between C 60 and multiply charged fullerene ions C 2+ 60 (Rohmund and Campbell 1995) and C 3+ 60 (Rohmund and Campbell 1997). The energy dependences of these cross sections showed a behaviour which could be explained in terms of nearly resonant charge transfer processes.…”