Abstract
A cw photomodulation technique has been applied to study the photoexcitation of a form of soluble polyacetylene with controlled conjugation length. We have been able to change the average conjugation length from a few hundred units down to 20 units. A systematic blue-shift of the photoinduced absorption spectra is observed upon decreasing the electronic delocalization. The linear dependence of the observed shift of the charged soliton band on the average conjugation length is discussed in terms of two different limiting models to describe the electronic properties of polyenes, namely the single-particle Su-Schrieffer-Heeger Hamiltonian and the Hubbard Hamiltonian.
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