Table 2: Elementary steps in the NCN pathway of prompt NO formation. The forward reaction rate is given by [13].

1 CH + N2 = NCN + H 0.0 22155 2 CN + N2O = NCN + NO 0.0 15360 3 CN + N2O = NCN + NO 0.0 1450 4 CN + NCO = NCN + CO 0.0 0.0 5 C2O + N2 = NCN + CO 0.0 17000 6 CH + N2 = HNCN −3.62 14196 7 HNCN + M = H + NCN + M −3.44 64502 8 HNCN + O = NO + HCN 0.05 73.5 9 HNCN + O = NH + NCO 0.05 73.5 10 HNCN +O = CN + HNO 0.05 73.5 11 HNCN + OH = NCN + H2O 2.78 3135 12 HNCN + O2 = HO2 + NCN 1.28 24240 13 NCN = N + CN −5.29 117090 14 NCN = C + N2 −5.23 83110 15 NCN = CNN −5.84 78410 16 NCN + H = HCN + N 0.0 8425 17 NCN + O = CN + NO 0.15 −34 18 NCN + O = CO + N2 2.32 −1135 19 NCN + O = N + NCO 0.42 −157 20 NCN + N = N2 + CN 0.0 0.0 21 NCN + C = CN + CN 0.0 0.0 22 NCN + OH = HCN + NO −0.97 7290 23 NCN + OH = HCN + NO 0.44 4000 24 NCN + O2 = NO + NCO 0.51 24590 25 NCN + CH = HCNCN 0.0 −860 26 NCN + CN = C2N2 + N 0.0 8020 27 NCN + CH2 = H2CN + CN 0.0 4630