Rate constant and branching fraction for the reaction of O+(2D,2P) with CO2

The rate constant and products of the reaction of O+(2D,2P) with CO2 have been measured. The measurements were carried out in a selected ion flow tube by the monitor ion method. The rate constant was found to be 1.06×10−9 cm3 s−1. The reaction was found to proceed by charge transfer (≥95%). This is in contrast to the reaction of the ground O+(4S) state for which the product is O+2. The rate constant for the excited state reaction is the same as that for the ground state reaction and is slightly less than the collisional limiting value.