EXCITATIONS IN A SPHERICAL 2-DIMENSIONAL ELECTRON-GAS - APPLICATION TO THE C-60 MOLECULE

The dielectric function of a spherical two-dimensional electron gas (2 DEG) is calculated in the framework of the random phase approximation. The whole spectrum of electron-hole and plasmon excitations is then c alculated numerically, along with the electron energy loss function. T he dispersion and strength of the plasmon mode as functions of the ang ular momenta are also obtained. The results are compared with those of a planar 2DEG with the same areal density.