Slow ions scattering on C[sub 60]: The electronic response of the C[sub 60] molecule and its ions

Cederquist, H.; Fardi, A.; Haghighat, K.; Langereis, A.; Schmidt, H. T.; Schwartz, S. H.; Levin, J.; Sellin, I. A.; Lebius, H.; Huber, B.; Larsson, M. O.; Hvelplund, P.
February 2000
AIP Conference Proceedings;2000, Vol. 500 Issue 1, p616
Academic Journal
In this progress report we discuss the electronic response of the C[sub 60] molecule and its positive ions by means of comparisons between experimental results and two different models for the charge mobility in C[sub 60]. We have measured projectile angular differential cross sections, dσ/dθ, and mean projectile energy gain/loss, ΔE, as functions of the number, s, of electrons stabilized on the projectile in 16 and 26.4 keV Ar[sup 8+]+C[sub 80]→Ar[sup (8-s)+]+C[sub 60][sup r+]+(r-s)e[sup -] collisions. In the infinitely conducting sphere (ICS) model the high mobility averages out all effects of localization of individual charge carriers. In the movable-holes (MHo) model ‘positive holes’ are localized as point charges in their equilibrium positions on the ‘molecular surface’ within the times (down to 10[sup -16] s) between sequential over-the-barrier electron transfers. The two sets of predictions for θ are close for r≤8, and for r≤5 they are also in agreement with experimental results indicating ultrafast electronic response of ionized C[sub 60]. For r>5, both models underestimate θ strongly which is due to close interactions with individual Carbon atoms. © 2000 American Institute of Physics.


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