Abstract
We calculate the potential energy of a charged soliton on a chain of polyacetylene in the presence of an (interstitial) impurity atom and Hubbard on-site interactions. Using this potential, we find the lowest two bound states of the soliton which determine the ``Goldstone-mode'' contribution to infrared absorption. The wave functions are then used to incorporate soliton dynamics into the calculation of optical absorption by the chain. Also included is a study of interaction effects on neutral solitons in pure polyacetylene.
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