Low Temperature Rate Constants for the Reactions of O( 1 D) with N 2 , O 2 , and Ar
Résumé
The kinetics of the gas-phase quenching reactions O(1 D) + N2, O(1 D) + O2 and O(1 D) + Ar have been studied over the 50-296 K temperature range using the Laval nozzle method. O(1 D) atoms were created in-situ by the pulsed photolysis of O3 precursor molecules at 266 nm. Rate constants for these processes were measured directly, following the decay of O(1 D) atoms through vacuum ultra violet laser induced fluorescence at 115.215 nm. For the O(1 D) + N2 and O(1 D) + O2 reactions, the quenching efficiencies are seen to increase as the temperature falls. For the O(1 D) + N2 system, this indicates the likely influence of the intermediate complex lifetime on the quenching rate through non-adiabatic processes. For the O(1 D) + O2 system which is considerably more complex, this behavior could result from the interactions between several potential energy surfaces.
Domaines
Chimie théorique et/ou physique
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