The photolysis of ozone (original) (raw)

1972, Journal of Photochemistry

Ozone was photolyzed at 25" C with steady illumination at several wavelengths from 2288 to 2850 A, at 0, pressures from 0.1 to 2.7 Torr, and at absorbed intensities, Ia, from 0.15 to 65 mTorr/min. Experiments were done in pure dry OS, and in the presence of He, COZ, The results show that in the absence of added gases or in the presence of He, the quantum yield of O3 consumption, -@{03}, is 5.5 independent of conditions, except at pressures below 0.4 Torr, where the yield drops towards 5.0 because of wall deactivation. In the presence of CO, or Nz, -@{O,} falls towards 4.0. The complete mechanism is outlined and it does not involve regeneration of O(lD) in the chain step. The primary photolytic act produces O(9) and singlet OS, presumably O,(lA), at all wavelengths below 3000 A.