Temperature dependent study of the kinetics of Sc(a 2D3/2) with O2, N2O, CO2, NO and SO2

Article abstract of DOI:10.1016/S0009-2614(97)00629-5

The gas phase reactivity of Sc(a ² D_3/2) 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(O₂) = (1.7 ± 0.4) X 10^-10 exp( - 7.9 ± 0.7 kJ/mol/RT) cm³ s^-1, k(N₂O) = (1.7 ± 0.3) X 10~10^-10 exp(-12.0 ± 0.6 kJ/mol/RT) cm³ S^-1, k(CO₂) = (7.3 ± 1.3) X 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 X 10^-11 and 2.0 X 10^-10 cm³s^-1, respectively. The disappearance rates for all the reactants are independent of total pressure indicating a bimolecular abstraction mechanism.