Abstract
We present the first laboratory measurement of the absolute second-order rate constant for the overall removal of O(2 3PJ) by NaO: [graphic omitted] k2=k2a+k2b. NaO was generated at known concentrations in the presence of an excess of He in a slow-flow system by titrating N2O with Na derived from a heat-pipe oven via the reaction Na + N2O → NaO + N2. Atomic chemiluminescence at λ= 589 nm [Na(3 2PJ)→ Na(3 2S1/2)+hν] subsequent to pulsed irradiation was then monitored in the time domain following reaction (2b). Analysis of the chemiluminescence profiles yielded k2(T= 573 K)=(3.7 ± 0.9)× 10–10 cm3 molecule–1 s–1. The importance of this reaction in interpreting the mesopheric chemistry of sodium is considered in detail. An estimate of the branching ratio α=k2b/(k2a+k2b) from the present measurements of ca. 1 % indicates a value considerably lower than that based on statistical considerations alone and used previously in computer models of the mesosphere.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
