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We extend the Su-Schrieffer-Heeger model of polyacetylene to C_{60} andC_{70} molecules, and solve numerically. The calculations of the undopedsystems agree well with the known results. When the system (C_{60} or C_{70})is doped with one or two electrons (or holes), the additional chargesaccumulate almost along an equatorial line of the molecule. The dimerizationbecomes weaker almost along the same line. Two energy levels intrude largely inthe gap. The intrusion is larger in C_{70} than in C_{60}. Therefore,``polarons'' are predicted in doped buckminster- fullerenes. We calculateoptical absorption coefficient for C_{60} in order to look at how ``polarons''will be observed. It is predicted that there appears a new peak at the lowerenergy than the intergap transition peaks. It is also found that C_{60} andC_{70} are related mutually with respect to electronical structures as well aslattice geometries. (to be published in Phys. Rev. B 45, June 15 issue)Comment: 21 page

physical review. b, condensed matter

Lattice distortion and energy-level structures in doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi></mml:mrow><mml:mrow><mml:mn>60</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi></mml:mrow><mml:mrow><mml:mn>70</mml:mn></mml:mrow></mml:msub></mml:…

Lattice distortion and energy-level structures in dopedC60andC70