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DOI: 10.1039/A701719G (Paper) Reference Section for: J. Chem. Soc., Faraday Trans., 1997, 93, 2657-2663

Upper limit for the generation of N2O from reaction of O2(A3Σu+) and N2

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Eunsook S. Hwang, Bart Buijsse, Richard A. Copeland, Haris Riris, Clint B. Carlisle and Tom G. Slanger

Abstract

Evidence from several sources suggest possible in situ production of N2O in the stratosphere. Considering that solar photoabsorption provides a large stratospheric source of O2(A3Σu+), and since vibrational levels of v[greater than or equal, slant]6 are primarily removed by N2, the O2(A3Σu+ )+N2 system is studied to determine whether it is an atmospherically significant N2O source. Using 243–250 nm photoexcitation to produce vibrationally excited O2(A3Σu+, v=7–10), and frequency modulation diode laser spectroscopy as the detector of N2O, we examine the products generated in a closed cell. We thereby set an upper limit of 0.002% on the N2O yield for the process, and conclude that stratospheric N2O production by this route is not significant compared to existing ground-based sources. The stability of N2O in an N2O–O3–N2 mixture subjected to prolonged 245 nm radiation is also studied. For low levels of O3 (10 ppm) and N2O (40–90 ppb), no loss of N2O is observed.

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