Resonance raman scattering from partially isomerized polyacetylene

Abstract

A study of Raman scattering from partially isomerized polyacetylene films with varying cis-trans content is presented. Major differences are discovered in the dispersion of trans-(CH)_x Raman bands between pure trans- and cis-rich samples. It is shown that the unusual dispersion of the trans-(CH)_x Raman bands in partially isomerized samples cannot arise from a distribution of short chains. These results are discussed in terms of the complex response of the lattice to the presence of photoinjected electron-hole pairs.