Abstract
We point out that interband mixing due to nonadiabatic effects of intramolecular vibrations (vibronic couplings) in molecules are important in a class of Jahn—Teller systems where the one-particle electronic energy difference Δϵ is comparable with the vibrational energy ω(Δϵ≈ω). The vibronic couplings in the other classes of Jahn—Teller systems where Δϵ ⪡ ω or Δϵ⪢ ω are small due to an antiadiabatic effect and adiabatic behavior, respectively. Our quantum-chemical calculation suggests that Δϵ is comparable with ω in doped C 60. The interband mixing due to the nonadiabatic effects of intramolecular vibration may be important in doped C 60.
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