Photogenerated Gap States in Polyacetylene

This paper reports the first observation of photogenerated gap states in polyacetylene, ${(\mathrm{CH})}_{x}$. A transient optical absorption, at photon energies less than the band gap, is produced by photogeneration of electron-hole pairs. The spectrum of this absorption is measured in both cis and trans isomers of ${(\mathrm{CH})}_{x}$. From a comparison of these spectra with similar spectra seen in molecular analogs of ${(\mathrm{CH})}_{x}$, it is concluded that these gap states are intrinsic, self-localized excitations of the semiconductor chain.

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