Charge transfer reactions of Kr2+ and Ne2+ ions with several molecular gases at 300 K

Measurements are reported of the rate coefficients and product-ion distributions for the reactions of Kr2+ and Ne2+ ions with H2, N2, O2, CO, CO2 and CH4 at 300 K. The data are obtained with a selected ion flow tube (SIFT). The reaction rates are generally fast, proceeding at or near the gas kinetic limit. In the Kr2+ reactions the only mechanism observed is single charge transfer, whereas for the more energetic Ne2+ ions parallel single and double charge transfer product channels are evident, the double charge transfer channels usually being dominant. The general features of the data are discussed in relation to those previously obtained for the corresponding reactions of Ar2+ and Xe2+ ions. (orig.)