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Distortions of polyacene polymers are studied within a many-body valence-bond framework using a powerful transfer-matrix technique for the valence-bond (or Heisenberg) model of the system. The computations suggest that the ground-state geometry is either totally symmetric or possibly exhibits a slight (A₂ or B₂ symmetry) bond-alternation distortion. The lowest-energy (nonsymmetric, in-plane) distortions are the A₂ and B₂ modes, which, within our approximations, are degenerate.
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García‐Bach et al. (1992) studied this question.
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