On the reaction of the NH2 radical with NO2 at 295–620 K

Product Branching Ratios of the NH2(X2B1) + NO2 Reaction

“…One is that the experiments of ref were performed at a total pressure of ∼30 Torr, while our data are at ∼2 Torr pressure. It is possible that the branching ratio depends on pressure, although this would be quite surprising, since the total rate constant displays no pressure dependence. , Another difference between their study and ours lies in the radical densities employed. Meunier et al quote [F] 0 = 5.7 × 10 14 molecules/cm 3 , in contrast to our typical [CN] 0 of ∼(2−4) × 10 13 .…”

“…The product channels of the NH 2 (X 2 B 1 ) + NO 2 reaction have until recently received much less study, however. Several possible product channels are thermodynamically accessible: − The total rate constant of reaction 1 has been measured by several groups. ,− Most measurements at 298 K have been in the range k 1 = (2.1−2.3) × 10 -11 cm 3 molecule -1 s -1 , although one study 20 reported a substantially lower value of k 1 = 9.3 × 10 -12 cm 3 molecule -1 s -1 . Measurements at elevated temperatures 15,17,20 have all shown that this reaction has a negative temperature dependence, although there is substantial disagreement on the rate constants at high temperatures.…”

“…The product channels of the NH 2 (X 2 B 1 ) + NO 2 reaction have until recently received much less study, however. Several possible product channels are thermodynamically accessible: [15][16] The total rate constant of reaction 1 has been measured by several groups. 15,[17][18][19][20] Most measurements at 298 K have been in the range k 1 ) (2.1-2.3) × 10 -11 cm 3 molecule -1 s -1 , although one study 20 reported a substantially lower value of k 1 ) 9.3 × 10 -12 cm 3 molecule -1 s -1 .…”

Diode Laser Study of the Product Branching Ratio of the NH2(X 2B1) + NO2 Reaction

“…Measurements at elevated temperatures 15,17,20 have all shown that this reaction has a negative temperature dependence, although there is substantial disagreement on the rate constants at high temperatures. Bulatov et al observed no dependence of the total rate constant on pressure over the range 10−650 Torr …”

“…The reaction NH 2 (X 2 B 1 ) + NO 2 , however, has been substantially less well characterized. This reaction has several thermodynamically accessible channels: where the thermochemical data were taken from ref , except for Δ H for channel 1b, which was taken from the QCISD calculations of Mebel et al The total rate constant of reaction 1 has been measured by several groups. ,− Most measurements at 298 K have been in the range k 1 = (2.1−2.3) × 10 -11 cm 3 molecule -1 s -1 , although one study 20 reported a substantially lower value of k 1 = 9.3 × 10 -12 cm 3 molecule -1 s -1 . Measurements at elevated temperatures 15,17,20 have all shown that this reaction has a negative temperature dependence, although there is substantial disagreement on the rate constants at high temperatures.…”