Linear carbon-chain radicals CnH for n = 2-7 have been studied with correlation consistent valence and core-valence basis sets and the coupled cluster method RCCSD(T). Equilibrium structures, rotational constants, and dipole moments are reported and compared with available experimental data. The ground state of the even-n series changes from2Σ+to2Π as the chain is extended. For C4H, the2Σ+state was found to lie only 72 cm-1below the2Π state in the estimated complete basis set limit for valence correlation. The C2H-and C3H-anions have also been characterized. © 1995.
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