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Accurate equilibrium (re) structures (ca. 0.0005 Å accuracy in bond lengths) have been established for linear C13 and C15 by applying a uniform correction to the results of CCSD(T) calculations with the cc-pVQZ basis set. The equilibrium bond lengths cover a small range between 1.2690 and 1.2928 Å and are indicative of strong carbon–carbon double bonds. Equilibrium structures of still longer chains...
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