Opticalabsorption spectra (OASs) of endohedral Er2C2@C-90 complexes, based on isomers nos. 44 (C-2) and 21 (C-1) of fullerene C-90, have been simulated. To this end, the energy spectra of these isomers have been calculated. The calculations have been performed within two models. Within the first (conventional) model, only hoppings ofit electrons between sites (nearest-neighbor hopping integral B similar to -2.6 eV) has been taken into account. Within the second model, intrasite Coulomb interaction (ISCI) of it electrons (Coulomb-interaction integral U similar to 7.0 eV) has been also taken into account along with intersite hoppings (nearest-neighbor hopping integral B similar to -1.0 eV). Comparison of the obtained OAS curves with the experimental data convincingly indicates that the second model describes adequately the OASs of endohedral Er2C2@C-90 complexes, based on the isomers under investigation. Charge transfer from the Er2C2 system to the fullerene shell was -4e.
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