Abstract
The monoexcited configuration interaction (MCI) spectrum of an infinite polyene with equal bondlengths is discussed in the framework of the π-electron approximation employing a Hubbard model hamiltonian. The MCI eigenvalue problem is reduced to a relatively simple equation for the excitation energies. The analysis of this equation shows that the monoexcitation spectrum of an infinite polyene differs noticeably from its approximation as orbital energy differences.
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