Abstract
We have measured the threshold center-of-mass kinetic energy for knocking out a single carbon atom from C60− in collisions with He. Combining this experimental result with classical molecular dynamics simulations, we determine a semi-empirical value of 24.1±0.5 eV for the threshold displacement energy, the energy needed to remove a single carbon atom from the C60 cage. We report the first observation of an endohedral complex with an odd number of carbon atoms, He@C59−, and discuss its formation and decay mechanisms.
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