Temperature dependent study of the kinetics of Sc(a 2D32) with O2, N2O, CO2, NO and SO2

The gas phase reactivity of Sc(a2D32) with O2, N2O, CO2, NO and SO2 in the temperature range 298–523 K is reported. The bimolecular rate constants are described in Arrhenius form by k(O)2) = (1.7 ± 0.4) × 10−10 exp(−7.9 ± 0.7 kJ/mol/RT) cm3 s−1, k(N2O) = (1.7 ± 0.3) × 10−10 exp)−12.0 ± 0.6 kJ/mol/RT) cm3 s−1, k(CO2) = (7.3 ± 1.3) × 10−11 exp(−12.3 ± 0.6 kJ/mol/RT) cm3 s−1 where the uncertainties are ±2σ. The rate constants with NO and SO2 were temperature insensitive with room temperature rate constants of 1.5 × 10−11 and 2.0 × 10−10 cm3 s−1, respectively. The disappearance rates for all the reactants are independent of total pressure indicating a bimolecular abstraction mechanism.