GAS-PHASE REACTIONS OF SOME POSITIVE-IONS WITH ATOMIC AND MOLECULAR-HYDROGEN AT 300 K

The reactions of CO+, CO2+, SO2+, NO2+, CS2+, CN+, C2N2+, and C2H3+ wi th H atoms and H-2 molecules have been studied in a selected ion dow t ube operated at (300+/-5) K. The H atom reactions proceed variously by the processes of atom exchange and charge transfer (when allowed), no ne proceed at the Langevin rate, and the rates of several of them appe ar to be influenced by the spin states of the product species. Most of the H-2 reactions proceed by H atom abstraction and at a large fracti on of the Langevin rate. (C) 1997 American Institute of Physics.