Abstract
Effects of the Coulomb field of dopant ions on charged solitons in a polyacetylene chain are studied using the PPP model. By choosing a suitable dopant-(CH) x potential the energy of a charged soliton-dopant ion pair can be made nearly independent of tte doping concentration. Upon pinning by dopant ion, the spatial extent of a charged soliton is contracted and the energy gap to the soliton level is increased. The excess and deficient charge densities of an interstitial soliton and a soliton hole, respectively, produced in a pinned charged soliton lattice have very broad and slowly varying distributions.
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