Classification of Disorder and Extrinsic Order in Polymers By Resonant Raman Scattering

Abstract

Resonant Raman scattering is used to quantify the effect of disorder and extrinsic order on Peierls systems such as ${\left(\mathrm{CH}\right)}_x$. We introduce "$\tilde{\lambda }$ plots" in which the phonon and gap distribution are related and characterize the system by the functional dependence of the gap $2\Delta$ on the coupling $\tilde{\lambda }$. For cis-rich trans-${\left(\mathrm{CH}\right)}_x$ the disorder is extrinsic with energy ${\Delta }^p$ and $p=1\mathrm{}$. For all trans-${\left(\mathrm{CH}\right)}_x$ the $\tilde{\lambda }$ plot yields intrinsic disorder, i.e., variation in the $e-p$ coupling. cis-${\left(\mathrm{CH}\right)}_x$ is ordered with a 5% extrinsic gap of the full energy gap of 1.95 eV.