Reactions of C+(P-2(u)) with CO((1)Sigma(+)) from thermal energies to 30 eV

The endoergic reactions of C+(P-2(u)) with CO((1)Sigma(+)) producing CO++C, C-2(+)+O, and O++C-2 have been studied in a guided-ion beam apparatus. For each reaction channel, we have measured the kinetic energy dependence of t he integral cross section and the reaction threshold. Analysis of the react ion cross sections yield the heats of formation Delta(f)H(0)(C-2(+))=19.79 +/- 0.16 and Delta(f)H(0)(C-2)=8.37 +/- 0.16 eV. In addition the dissociati on energy of C-2 is estimated to be D-0(C-C)=6.37 +/- 0.16 eV. A simple sta te correlation diagram is used to rationalize experimental observations and to discuss reaction dynamics. (C) 2000 American Institute of Physics. [S00 21-9606(00)02603-9].