The chemical and energy structures of highly fluoridated fullerene fil
ms have been investigated. Analysis of the complex structure of carbon
Is spectra showed the presence of C-F and C-F2 fragments as well as n
onfluoridated carbon atoms with an overwhelming quantity of C-F bonds.
The band gap in fluoridated-fullerene and its films was estimated to
be 8.0 eV and energy loss on an interband transition at 11 eV was also
observed. Comparison of the valence-band spectra of the experimental
samples showed that the valence band of fluoridated fullerenes is divi
ded into anionic and cationic parts (similarly to alkali-halide crysta
ls) and suggests that fluoridated fullerenes possess the corresponding
properties, making it possible to find new materials with wide practi
cal applications. (C) 1998 American Institute of Physics.