4640
J . Phys. Chem. 1986, 90, 4640-4644
+ +
The results indicate that @{N2) @(H2) = 1.0 in accordance with eq d and e. Likewise, @{imine) @(DEHA]= 1.O in accordance with eq f. From eq g, k9a/k9b= 9.5 f 1.7.
Acknowledgment. We thank R . Minard for many helpful suggestions and for performing the GC-MS analyses and Neville
Drysdale for help in synthesis of several compounds.
Supplementary Material Available: Tables I, 11, and V containing mass spectral data, quantum yields, and effect of irradiation time for the reactions studied (3 pages). Ordering information is available on any current masthead page.
Absolute Rate Constants for the Gas-Phase Reactions of the NO3 Radical with CH,SCH,, NO2, CO, and a Series of Alkanes at 298 f 2 K Timothy J. Wallington,+ Roger Atkinson,* Arthur M. Winer, and James N. Pitts, Jr. Statewide Air Pollution Research Center, University of California-Riverside, (Received: January 29, 1986)
Riverside, California 92521
A flash photolysis-visible absorption apparatus has been constructed and employed in a study of the kinetics of the gas-phase reactions of the NO, radical with CH3SCH3,NO2,CO, CH4, C2H6,and n-C4Hlo. The measured absolute rate constants at 298 f 2 K are as follows (in units of lo-', cm3 molecule-] s-'): CH,SCH3, 7.5 0.5 independent of pressure over the range 50-400 Torr; NO2, 5.6 f 0.4 and 8.0 f 1.1 at 120 and 400 Torr total pressure of helium, respectively; CO, 10.00003; CH,,
