Kinetics of the reactions of NH/sub 2/ radicals with O/sub 3/ and O/sub 2/

Journal Article · Thu Feb 02 04:00:00 EST 1984 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j150647a034· OSTI ID:5127284

Patrick, R; Golden, D M

NH/sub 2/ radicals were generated by the photolysis of O/sub 2/ in the presence of NH/sub 3/ and their subsequent kinetics were directly monitored by laser resonance absorption spectroscopy. Under experimental conditions, NH/sub 2/ + O/sub 3/ and NH/sub 2/ + NH/sub 2/ were competitive reactions. The rate constant for NH/sub 2/ + O/sub 3/ was found to be (1.57 +/- 0.51) x 10/sup -11/ exp(-(1151 +/- 123)/T) cm/sup 3/ molecule/sup -1/ s/sup -1/ in the temperature range 272-348 K while the rate constant for NH/sub 2/ + NH/sub 2/ was found to be 1.29 +/- 0.30) x 10/sup -11/ cm/sup 3/ molecule/sup -1/s/sup -1/ at 298 K and essentially independent of temperature at a pressure of approx.200 torr. O/sub 2/ was added to the system in an attempt to observe a postulated third-order reaction leading to the formation of NH/sub 2/OO. An upper limit of 1.5 x 10/sup -36/ cm/sup 6/ molecule/sup -2/s/sup -1/ was set for this process indicating that bonding between NH/sub 2/ and O/sub 2/ is negligible.

• Research Organization: SRI International, Menlo Park, CA
• DOE Contract Number: AC03-78EV10121
• OSTI ID: 5127284
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 88:3; ISSN JPCHA
• Country of Publication: United States
• Language: English

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