In situRaman spectroscopy of the electrochemical doping process in polyacetylene

Results of in situ Raman scattering experiments during the electrochemical $p$ doping of cis- and trans- polyacetylene are reported. Doping the cis-isomer led to a complete isomerization, and a phase separation between the doped and the undoped parts of the samples is observed. The disordered trans-polymer dopes faster as compared with the cis-isomer and the crystalline trans-isomer. During the discharge process the crystalline parts of the trans-isomer undope first.