Chain-Pairing Effects in One-Dimensional Conjugated Polymers and Semiconductors

Abstract
We explain the absorption line and resonant Raman lines splittings together with the selection rules at low temperatures in polydiacetylene polymer crystals in terms of a chain-pairing mechanism arising from side-group interactions between the conjugated carbon chains. The symmetry of the pairing configuration has drastic effects on the one- and two-photon absorption spectra.