The endoergic reactions of C+(2Pu) with CO(1Σ+) producing CO+ +C, C2++O, and O++C2 have been studied in a guided-ion beam apparatus. For each reaction channel, we have measured the kinetic energy dependence of the integral cross section and the reaction threshold. Analysis of the reaction cross sections yield the heats of formation ΔfH0(C2+)=19.79±0.16 and ΔfH0(C2)=8.37±0.16 eV. In addition the dissociation energy of C2 is estimated to be D0(C–C)=6.37±0.16 eV. A simple state correlation diagram is used to rationalize experimental observations and to discuss reaction dynamics.

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