VIBRATIONAL ANALYSIS AS A TOOL FOR DETECTING ELECTRONIC MOBILITY - THE CASE OF THE ALTERNATING ETHYLENE-TETRAFLUOROETHYLENE COPOLYMERS

Frequency and intensity spectroscopies have been used in the reanalysi s of the vibrational spectrum (IR and Raman) of alternate copolymers o f ethylene and tetrafluoroethylene. A new assignment of the CH stretch ing fundamental is proposed. The seeming anomalies of the infrared spe ctrum in the CH stretching range are accounted for in terms of equilib rium atomic charges and charge fluxes. In particular, the analysis of the dichroic ratios shows that there exists a relevant mobility of the electronic charge along the C-C bonds.