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On the basis of the temperature dependence of the ESR spectrum, the optically induced unpaired spins in [Pt(en) 2 ][Pt(en) 2 Cl 2 ](ClO 4 ) 4 , where en is ethylenediamine, are verified to form dimeric states of Pt ions which are mobile but transport no electric charge. The dimer hops along the ···-Pt-Cl-Pt-Cl-··· chain in a manner of random walk. The hopping rate is given by ν c =ν 0 exp (-Δ/ k T ) with ν 0 =1.3×10 9 sec -1 and Δ=13±1 meV over a wide temperature range from liquid He to the ambient. This state is most likely the neutral soliton.
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Kuroda et al. (1990) studied this question.
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