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Theoretical evidence for stable biexcitons are found within the Coulomb-correlated model for π-conjugated polymers, for realistic Coulomb interaction parameters. High energy picosecond photoinduced absorption, not anticipated within one-electron theories of π-conjugated polymers, is explained as a transition from the optical exciton to the biexciton.
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Guo et al. (1995) studied this question.
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