C60 matrix-isolated in Xe: plasmon shifts and polarization effects

Energy loss features for solid C₆₀, matrix-isolated C₆₀ in Xe, and for small amounts of C₆₀ on Xe showed differences related to the rare gas environment. In contrast, losses related to on-site $\text{π−π}{}^{\mathrm{\ast }}$ shake-up features were unchanged. The energy of the molecular it plasmon shifts ∼ 0.8 eV to lower binding energy for matrix isolated C₆₀ due to the dielectric response of the surrounding medium. The work function of solid C₆₀ is 5.0 eV. Its ionization potential of 7.2 eV shows a reduction by 0.4 eV relative to the gas phase because of dielectric screening.