Note on the determination of the efficiency of the reaction N₂(A³Σ)+O(³P) to N₂+O(¹S)

An Upper Limit on the Formation of NO(X2Πr) in the Reactions + O(3P) and + at 298 K

“…First, the NO(X 2 Π r ) + N( 4 S, 2 D) product yield accounts for e2% of the N 2 (A 3 Σ u + ,V′ e 2) + O( 3 P) interaction. This is qualitatively consistent with the high O( 1 S) yields observed previously 13,19,20 but somewhat smaller than suggested by those studies. Second, the NO(X 2 Π r ) + NO(X 2 Π r ) product yield in the reaction N 2 -(A 3 Σ u + ,V′ e 6) + O 2 (X 3 Σ g -,V′ ) 0) represents < 0.1% of the [N 2 (A 3 Σ u + )] total .…”

“…9,11,[16][17][18] Studies by Piper 19 and De Souza et al 13,20 have confirmed that the major product channel in the reaction N 2 (A 3 Σ u + ) + O( 3 P) is N 2 (X 1 Σ g + ) + O( 1 S) with a branching fraction of 75 ( 13% and 90 ( 33%, respectively. Swider 9 has pointed out that the N 2 (A 3 Σ u + ) + O( 3 P) reaction could also be a source of vibrationally hot NO-(X 2 Π r ) and odd nitrogen, N( 4 S, 2 D).…”

“…The f V 's were determined experimentally26 and numerically 29,42. An average of the vibrational level specific k V 's and K V 's reported in the literature was used in the calculation for V′ e 6 and V′ e 3, respectively 12,14,15,20,44 For K V 's 4 e V e 6, the bimolecular rate constants were estimated using the power law dependence of K, i.e., K V ∝ V n .…”

Active nitrogen and oxygen: Enhanced emissions and chemical reactions

“…It should also be noted that, in contrast to the assumed [14,30,57,58] {O 2 (a 1 D g ) + N( 4 S)} chemical reaction, there is clear evidence of O( 1 S) product formation assigned to the fN 2 ðA 3 R þ u Þ þ Oð 3 PÞg chemical reaction [54,55,73,74]. However, the reported branching fraction {>0.25 [55], (0.75 ± 0.13) [54] and (0.80 ± 0.25) [73]} for O( 1 S) product formation was estimated from the variation of the concentration ratio ½Oð 1 SÞ=½N 2 ðA 3 R þ u ; m ¼ 0Þ as a function of the O( 3 P) atom concentration.…”

“…However, the reported branching fraction {>0.25 [55], (0.75 ± 0.13) [54] and (0.80 ± 0.25) [73]} for O( 1 S) product formation was estimated from the variation of the concentration ratio ½Oð 1 SÞ=½N 2 ðA 3 R þ u ; m ¼ 0Þ as a function of the O( 3 P) atom concentration. Therefore, the determined values of the reported branching fraction [54,55,73] are also expected to have been affected by the extraneous change in the ½N 2 ðA 3 R þ u Þ; m in active nitrogen and oxygen caused by discharged oxygen, already mentioned in Section 5.1, apparently due to the energy transfer fO 2 ða 1 D g Þþ N 2 ðA 3 R þ u Þg. If the ½N 2 ðA 3 R þ u Þ; m ¼ 0, used for the O( 1 S) product formation yield estimation, was lower (because of its extraneous decay due to the fast energy transfer reaction fO 2 ða 1 D g Þþ N 2 ðA 3 R þ u Þg), then a higher O( 1 S) branching fraction (O( 1 S) formation percentage) would result.…”