Calculation of [O2(1Δg)] in the atmosphere using new laboratory data

In this paper atmospheric [O2(1Δg)] calculations of based on laboratory rate coefficients for the several processes of possible importance are described. The calculations are in accord with experimental observations. Even when solar radiation is strongly attenuated at λ 3100 A by the spin-forbidden process O3(1A) + hν → O2(1Δg) + O(3P). The possible great importance of this conclusion in the chemistry of polluted atmospheres is discussed. The results indicate the importance of O2(1Δg) production at λ>3100 A in the interpretations of the infrared atmospheric band of the airglow in the lower regions of the stratosphere. It may also be necessary to allow for this process in the explanation of twilight observations of [O2(1Δg)].