O/1S/ yield from O3 photodissociation at 1700-2400 A

The paper discusses the O(1S) yield from O3 photodissociation measured in the 1700-2400 A region using synchrotron radiation as a light source. An upper limit for the yield set at 0.1% for the entire photon energy range indicates that the contribution of O(1S) to atmospheric OH production is not significant. The spin restriction for going into the O(1S) + O2/X3Sigma(-)(g)/ channel appears to be the determining factor in the low yield. There are three spin-allowed channels to produce excited O2 molecules with thresholds between 2300 and 2650 A; it is recommended to investigate these dissociative pathways.