We study the extinction spectra of an isolated C60 molecule, within the framework of the vector wave function method. Electronic excitations on the C60 molecule surface are modeled by an inï¬nitesimally thin spherical layer of the s and Pi electrons, which is described by means of the twodimensional twofluid model. Numerical results show that a strong interaction between the fluids gives rise to the
splitting of the extinction spectra into two peaks in a quantitative agreement with the Pi and sigma + Pi
plasmon energies.
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