Infrared-active vibrational modes of charged solitons in(CH)xand(CD)x

We present a joint experimental and theoretical study of the lattice dynamics of polyacetylene, including both the unperturbed polymer and the doped polymer containing charged solitons at dilute concentrations. A quantitative understanding of the Raman spectra and the soliton-induced infrared absorption in trans-${\left(\mathrm{CH}\right)}_x$ and trans-${\left(\mathrm{CD}\right)}_x$ has been achieved. The detailed agreement between calculated and experimentally observed infrared-active vibrational modes provides specific experimental evidence of soliton doping in polyacetylene.