Rate Constants and Branching Ratios for the Dissociative Recombination of CO(2)+

摘要

The overall rate constant of the dissociative recombination of CO(2)+ was first measured in 1967. Since then, the room-temperature rate was measured several times and the values obtained varied in the narrow range of (3.1-4.0) x 10(exp -7) cu cm s(exp -1). Recently, the rate was measured at the Aarhus storage ring in Denmark (ASTRID) and found to be larger, 6.5 x 10(exp - 7) cu cm s(exp -1) at 300 K, with an electron temperature dependence of Tau(exp 0.8). Experiments carried out at the ion storage ring CRYRING, operated by the Manne Siegbahn Laboratory of Stockholm University, yield data that are in excellent agreement from 0.008 to 0.2 eV. Below 0.008 eV, the CRYRING data are higher, and are believed more reliable at lower energies because of the narrower energy distribution in the CRYRING experiment. A small difference at higher energies may be caused by smaller accumulation times and therefore poorer statistics in the CRYRING experiment.