Abstract
The nature of various photoinduced absorption (PA) bands in conducting polymers is still not completely resolved. We have introduced a novel technique, spin-dependent photomodulation (SDPM), in which we measure changes in c.w. PA due to resonant absorption of microwaves in magnetic fields, to elucidate the spin states associated with the photoexcitations related with the PA bands. We have used the SDPM technique to study spin states in soluble trans-(CH) x and oriented poly( paraphenylene vinylene) (PPV) films. We have verified that the long-lived charged excitations are associated with spinless features in PA whose recombination (or generation) is spin dependent. These are charged solitons in (CH) x and charged bipolarons in PPV. The stable neutral excitations, on the other hand, are self-trapped triplet excitons in the non-degenerate ground state PPV and neutral solitons in the degenerate ground state (CH) x .
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