VACUUM-ULTRAVIOLET PLASMA FRENKEL EXCITONS - ELEMENTARY EXCITATIONS OF POLYMERIZED FULLERENE

The high-frequency excitations of the molecular insulator C-60 are inv estigated theoretically. The model of a quantum well rolled into a sph ere is used to calculate the dipole (multipole in the general case) mo des of an individual C-60 cluster. If the spectrum and oscillator stre ngths of the collective modes of an individual cluster are known, the microscopic continuum approach can be used to calculate the spectrum o f delocalized excitations in a cluster crystal. Then the ordinary diel ectric constant formalism permits calculation of the optical character istics of the material in the vacuum ultraviolet region studied. (C) 1 998 American Institute of Physics.