Collisional Formation of Metallofullerenes
Metallofullerenes are synthesized by bombarding C60 with alkali metal ions. Two different approaches are used: Ion implantation into a film of fullerenes, and gas-phase collisions. The film is grown by vapor deposition onto a rotating target; metal ions produced by surface ionization are co-implanted during film growth. A pulsed laser beam subsequently desorbs and ionizes the material into a time-of-flight mass spectrometer. The relative yield of NaC60 ions reaches 37 % at an implantation energy of 100 eV. In another experimental approach, a metal ion beam is crossed with a thermal beam of fullerenes; metallofullerene and fullerene product ions are identified in the mass spectrometer. Our results (relative yields, appearance energies, breakdown energies) deviate significantly from those reported by other authors.
Cluster and Nanostructure Interfaces
Digital Object Identifier (DOI)
R. Deng, R. MacCrimmon, and O. Echt, Collisional Formation of Metallofullerenes, Cluster and Nanostructure Interfaces, P. Jena, S N. Khanna and B. K. Rao, eds., World Scientific, 2000, p. 437 - 442.