Kinetic Investigation of the Reaction Sr(1S) + O2 + He in the Temperature Range from 303 to 968 K
| Autor: | Christiaan Vinckier, Joëlle Helaers |
|---|---|
| Rok vydání: | 1998 |
| Předmět: |
Arrhenius equation
Strontium Chemistry Analytical chemistry chemistry.chemical_element Atmospheric temperature range Kinetic energy Arrhenius plot law.invention symbols.namesake law symbols Physical chemistry Physical and Theoretical Chemistry Bond energy Atomic absorption spectroscopy Equilibrium constant |
| Zdroj: | The Journal of Physical Chemistry A. 102:8333-8338 |
| ISSN: | 1520-5215 1089-5639 |
| DOI: | 10.1021/jp981998b |
| Popis: | A kinetic study of the third-order recombination reaction Sr(1S) + O2 + 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 > ... |
| Databáze: | OpenAIRE |
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