Abstract
Two peaks are observed in the third-harmonic generation (THG) of polyacetylene. The first peak at 0.6 eV is a three-photon resonance enhancement due to the first one-photon excited state 1 1B u. Within an interacting-electron model, we investigated the excitonic states in conjugated polymers. Our result suggests that the second peak at 0.9 eV is a three-photon resonance enhancement at the edge of the continuum excitation band.
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