Kinetic investigation of the reaction Sr(1S) + O2 + He in the temperature range from 303 to 968 K
A kinetic study of the third-order recombination reaction Sr(1S) + O2 + He k1(He)→ SrO2 + He has been carried out in a fast-flow reactor in the temperature and pressure range of respectively 303-968 K and 6-12 Torr. Strontium atoms were generated by thermal evaporation of strontium metal pellets and then monitored by atomic absorption spectroscopy (AAS). The Arrhenius plot shows a departure from linearity above 500 K. The modified Arrhenius expression taking into account a temperature dependence of the preexponential factor for the entire temperature range results in the expression k1Sr(He) = [(1.9 ± 0.3) × 10-23]T-1.7 exp-[(-12.1 ± 0.8 kJ mol-1)/RT] cm6 molecule-2 s-1. The best representation of the temperature dependence is given by the polynomial fit log k1Sr(He) = -60.83 + 22.44(log T) - 3.89(log T)2. A lower limit to the bond energy of the SrO2(3A2) reaction product is estimated by means of the method based on the expression of the equilibrium constant and the theory of statistical mechanics. A value of D0 > 244 kJ mol-1 was obtained, which is in the range of the values derived from ab initio calculations.
Reactions of Pulsed-Laser Evaporated Ca, Sr, and Ba Atoms with O2. Infrared Spectra of the Metal Oxides, Oxide Dimers, Dioxides, and Peroxides in Solid Argon
Pulsed-laser ablated Ca, Sr, and Ba atoms have been reacted with O2 in excess argon during condensation at 10 K.Infrared spectra and oxygen isotopic substitution show that the major products are the symmetrical OMO metal dioxide and the rhombic metal oxid
Andrews, Lester,Yustein, Jason T.,Thompson, Craig A.,Hunt, Rodney D.
p. 6514 - 6521
(2007/10/02)
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