Abstract
Electron spin echo (ESE) measurements of donor-doped (Li, Na, K and Cs) and acceptor-doped (AsF 5) poly(p-phenylene), PPP, and fully deuterated PPP samples predict a temperature independent EPR linewidth equal to less than 0.65 gauss that decreases with increasing conductivity. In contrast, EPR linewidths either decrease or increase with decreasing temperature, are dependent on dopant and always exhibit a linewidth either equal to or larger than that predicted from ESE measurements. Deuteration studies indicate that rapid spin exchange is present. Analysis of these results suggest that an exchange exists between isolated radicals in equilibrium with polarons and bipolarons with the equilibrium in favor of bipolarons at 4 K.
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