1 O + N2(A3Σ) => NO + N(2D) [4] 2 NO + O2 + M => NO3 + M [9]  3 NO3 + N(2D) => NO2 + NO(B2Π) Newly proposed 4 NO(B2Π) + N2(v=1,2) => NO + N2(A3Σ+u) Newly proposed 5 N(2P) + O => NO+ + e- [17] 6 NO + O + M => NO2** + M [22] 7 NO3 + NO2** => NO2 + NO2*+ O Newly proposed 8 NO3 + NO2* => 2NO2 + O Newly proposed

Table 1: Mechanism of nitrogen oxidation chain reaction.