Rate Constants for the Thermal Dissociation of N2O and the O(3P) + N2O Reaction

The thermal dissociation of N{sub 2}O in argon was investigated by monitoring the formation of O({sup 3}P) atoms in the reflected shock regime using atomic resonance absorption spectrophotometry (ARAS). Values for the bimolecular rate constant (131 points), derived under low-pressure limit conditions are given by the Arrhenius expression given here. These results extend the low-temperature range of ARAS measurements of k{sub 1} by about 200{degree}C which is very significant in 1/T; and the value of the rate constant was extended by more than an order of magnitude. The present data were combined with previously published ARAS data to form a composite data set with a total of 278 points. Although systematic differences between the data of the various groups were discernible, all the data are well represented by another Arrhenius equation as given herein. Uncertainties in the Arrhenius expression are given at the one standard deviation level and the mean deviation of the experimental data from that predicted by the expression is {+-}26%. These results are compared to those from previous experimental studies. The rate of the reaction of O({sup 3}P) with N{sub 2}O was investigated experimentally and by kinetic modeling, but only over a limited temperature range, 1200

Keywords:

• Computational chemistry
• Photochemistry
• Atom
• Chemical reaction
• Experimental data
• Reaction rate constant
• Arrhenius equation
• Order of magnitude
• Standard deviation
• Chemistry
• Atmospheric temperature range
• Oxygen
• Argon
• Dissociation (psychology)
• Spectrophotometry
• Absorption spectroscopy
• Physical chemistry

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