| Abstract
| - Time-resolved atomic resonance absorption spectroscopy was employed, with flash-photolysis generation ofatomic potassium and sodium at 734 K, to investigate the kinetics of K + NO + Ar and Na + NO + Ar. Thelow-pressure limit recombination rate constants are (1.0 ± 0.2) × 10-31 and (1.9 ± 0.5) × 10-32 cm6 molecule-2s-1, respectively. Mainly ionic, triplet state adducts are predicted. RRKM modeling yielded K−NO and Na−NO bond dissociation enthalpies of 104 and 66 kJ mol-1, which compare well with UQCISD(T)/6-311+G(2d) ab initio values of 81 and 68 kJ mol-1, respectively. For Li + NO +Ar, the predicted binding energyis 134 kJ mol-1, which yields a predicted rate constant of 1.4 × 10-31 cm6 molecule-2 s-1.
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