“…NO + is also an abundant ion in lean flames and, again, its primary removal mechanism is dissociative recombination. It is not surprising, therefore, that there have been many studies of the rate of NO + recombination using a variety of techniques including stationary afterglows [2][3][4][5][6][7], shock tubes [8][9][10], flame sampling [11], ion trap [12], merged beams [13,14] and flowing afterglows [15][16][17]. Branching ratios for the products of the recombination have been measured using a photoionization method [18] and in a merged beams experiment [14].…”