Kinetics of gas phase ion–ion recombination in NO++X–→ NO+X for X being chlorine, bromine and iodine
Abstract
The rate coefficient k1 for the gas phase recombination of NO+ with halide ions X– in NO++ X–→ NO + X has been measured in flames of C2H2+ O2+ N2 over the temperature range 2200 to 2650 K. Chlorine, bromine and iodine have been used as X. All k1 values are in the range 0.8–2.1 × 10–8 ion–1 cm3 s–1, corresponding to cross-sections (πσ2) of ∼10–17 m2. For each halogen, k1 has a negative temperature coefficient. Also at any one temperature, k1 is largest for X being chlorine and smallest for iodine. In general, these measurements are in agreement with Olson's “absorbing sphere” model for ion–ion recombination.