Is O2*(a1Δg) Formed in the O+O3, H+O3, and NO+O3 Reactions ?

An attempt was made to detect O2*(a1Δg) in the reactions of O+O3, H+O3, and NO+O3 using a photoionization mass spectrometer. No significant signals for O2*(a1Δg) were observed in these reactions. From the results, it is concluded that less than 0.06, 0.001, and 0.002 of the reactive collisions result in the production of O2*(a1Δg) in the reactions of O+O3, H+O3, and NO+O3 respectively, all at 298 K. The failure to observed O2*(a1Δg) in these reactions was discussed by means of correlation diagrams and GVB model representations.