Doping induced disorder in trans-polyacetylene: A spectroscopic and dynamical study

The results of lattice dynamical calculations on pristine and doped trans- polyacetylene are summarized and a reinterpretation of the vibrational spectrum is suggested. The possibility of the existence in the doped system of a centrosymmetrical molecular defect, consistent with the infrared spectrum, alternative to the soliton defect is discussed.