Collision energy dependence of He and Ne capture by C+60

Recently, reports of the formation of endohedral cluster compounds HeαC+n and NeαC+n-4 (n even and ≤60) have been published for high energy collisions between C+60 and rare gases. Here we present the collision energy dependence for the formation of HeαC+60 and NeαC+60 in the region of the energetic threshold for the capture process. The threshold for He capture lies at 6±2 eV in the centre of mass reference frame whereas that for Ne lies somewhat higher at 9±1 eV. (α means endohedral fulleren compounds.) (orig.)