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UV spectra of polydiacetylene (PDA) chains in their monomer single crystal matrix show an absorption near 4 eV and above, predominantly polarized perpendicular to the chain direction. It is shown by combining absorption and electroabsorption studies that the spectrum corresponds to an excitonic transition. This exciton has polarizability and binding energy comparable to those of the well-known exciton...
Triplet states of 3- and 4-BCMU isolated polydiacetylene chains dispersed in their single-crystal monomer matrix are studied by subpicosecond pump-probe experiments. Triplet population is monitored by an intense and narrow TT * photoinduced absorption band near 1.35 eV at 20 K. In our experimental conditions, we find that triplets are generated by two different processes: fission of singlets...
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