On the significance of hyperpolarizability dispersion in fullerene molecule

The peculiarities of the absorbtion spectrum with the long-wave-length forbidden transitions preceding the first sharp absorbtion peak are shown to be responsible for the experimentally observed high nonlinear optical properties of the fullerene molecule. In this way the discrepancy between the calculated and measured values is reduced. The three-level model as well as the more sophisticated time-dependent Hartree-Fock theory are used.