Abstract
Excited species are of interest in atmospheric chemistry since they may undergo reactions that are slow, or impossible, for the ground state species. Further, the excited species can undergo radiative energy loss thus possibly contributing to the energy balance and providing emission from the atmosphere. Excited O and O2 are certainly present in the earth’s atmosphere since features in the day and night airglow derive from optical transition from these species. The excited species of oxygen to be discussed in this paper are all singlets (O(1D), O(1S), O1(1Δg), O1. The electric dipole selection rule, ΔS = 0, therefore formally ‘forbids’ optical transitions to the ground, triplet, states, and the species are therefore ‘metastable’: that is, they have long natural lifetimes in the absence of reactive or quenching collisions. In addition, these states of O and O2 have low excitation energies, so that they can become excited in relatively low energy chemical or photochemical processes. Table I shows the excitation energies, optical transitions and lifetimes for the species under consideration.
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© 1973 D. Reidel Publishing Company, Dordrecht, Holland
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Wayne, R.P. (1973). Reactions Involving Excited States of O and O2 . In: McCormac, B.M. (eds) Physics and Chemistry of Upper Atmosphere. Astrophysics and Space Science Library, vol 35. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-2542-3_13
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