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The geometries for the planar T1 states of linear polyenes CnHn+2 (n=8, 10, 12, 14, 16, 18, 20, and 22) were optimized by ab initio SCI calculations. It was found that the bond alternation which existed in the S0 state disappears only in the central region of the polyene chain. This is quite similar to the ‘triplet-excited region’ which was observed in PPP SDCI calculations for decapentaene (n=10),...
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