Journal of the Chemical Society - Faraday Transactions p. 1751 - 1756 (1990)
Update date:2022-08-11
Topics:
Frost, Michael J.
Smith, Ian W. M.
The kinetics of the reactions of CH3O and C2H5O radicals with NO2 have been studied using pulsed laser photolysis to create the radicals from the corresponding alkyl nitrite and by time-resolved, laser-induced fluorescence to observe the decay of the radical concentration.At 295 K, rate constants for CH3O+NO2 have been measured in the presence of Ar (6-100Torr), He(30-100 Torr) and CF4 (30-125 Torr).The association reaction to CH3ONO2 appears to predominate, and rate constants in the limit of low and high pressure are deduced: (k0/10E-29 cm6 molecule-2 s-1) =2.8+/-0.6(M=Ar); 1.6 +/- (M=He); 3.4+/-1.0(M=CF4), and (kinfinite/10E-11 cm3 molecule-1 s-1)=2.0+/-0.4, where the quoted errors correspond to two standard deviations.A limited number of measurements is also reported for this reaction at 390K.The rate of the reaction of C2H5O with NO2 at 295 K is found to be same in the presence of 15 and 100 Torr of Ar, and the measurements yield a rate constant: (kinfinite/10E-11 cm3 molecule-1 s-1) =2.8+/-0.3.
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