Spectroscopic study reveals diffusion-governed photoexcitation transfer from cis to trans segments in polyacetylene films, indicating rapid isomer-dependent energy relaxation.
We have measured photoexcitation dynamics in the picosecond time domain in fully trans and partially isomerized (CH)ₓ and (CD)ₓ films with different cis/trans content ratios, using the technique of transient photoinduced resonant Raman scattering. Following the distinctively different decay kinetics of cis and trans resonantly enhanced vibrations, we observed an intersystem crossing of photoexcitations from cis to trans segments which is dominated by a diffusion process in the cis segments, with a time constant between 24 and 215 ps depending on the cis/trans ratio.
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Lanzani et al. (1992) studied this question.
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