The effect of collision energy and vibrational excitation on the reaction of C2H+2+H2

摘要

The relative efficiencies between the excitation of Cndash;C stretching vibration and collision energy on the promotion of the H atom transfer reaction of C2H+2+H2rarr;C2H+3+H have been examined. At low collision energies the reaction is strongly vibrationally enhanced in agreement with previous thermal energy studies. Translational energy was found to be not as effective as exciting the Cndash;C stretching vibration in promoting the reaction. The results indicate that the H atom transfer from H2to the C atom should have a late barrier, but the Cndash;C stretching vibration of C2H+2is apparently coupled to the reaction coordinate. Because the Cndash;C bond in C2H+3is expected to be longer than that of C2H+2, vibrational energy added to the Cndash;C bond might reduce the barrier for H atom transfer from H2to a C atom in C2H+2.