Photoinduced steady-state spectroscopy of a highly stable soluble polyacetylene blend: neutral soliton states and thermal effects

We have investigated steady-state photoabsorption spectra of a soluble polyacetylene prepared by a recently devised technique. Measurements were carried out both on solutions and trans-isomerized films. We have found that photoexcitation of the polyacetylene transforms only into neutral solitons in the temperature range 85–300 K. Simultaneously, photoabsorption spectra of films show thermal bands due to temperature modulation of the absorption edge.