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By Guy P. Brasseur, Susan Solomon

"[…] a fascinating and well-written evaluation of the present prestige of our wisdom of the composition of the center surroundings and the fundamental radiative, dynamical and photochemical strategies which hold it." (Bulletin American Meteorological Society)

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Additional info for Aeronomy of the Middle Atmosphere: Chemistry and Physics of the Stratosphere and Mesosphere (Atmospheric and Oceanographic Sciences Library)

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Geophys Res Lett: 25, 647, 1998. , Physical Chemistry. Prentice Hall, 1962. G. Calvert, Reaction probability of N2 O5 on aqueous aerosols. J Geophys Res: 93, 15,889, 1998. , A. J. J. B. Burkholder, H + O3 Fourier-transform infrared emission and laser absorption studies of OH (X2 π) radical: An experimental dipole moment function and state-to-state Einstein A coefficients. J Chem Phys: 93, 7003, 1990. , Microphysics and heterogeneous chemistry of polar stratospheric clouds. Ann Rev Phys: 48, 785, 1997.

Unfortunately, the actual interactions between reacting gases are considerably more complex than this and not all two-body rate constants are equal to 4 × 10−11 (in fact few of them do conform to this simple description). The reasons for this lie in the differences between the actual interactions between reacting molecules and the “hard sphere” assumption made above. In general, particles form an intermediate species during reaction, and this intermediate is often called an activated complex. , RRK theory, see Rice and Ramsperger, 1927; Weston and Schwarz, 1972).

In contrast, the NO (A2 Σ+ ) → NO (X2 Π) transition is fully allowed and the radiative lifetime of this state is correspondingly short. 88) followed by and finally 46 AERONOMY OF THE MIDDLE ATMOSPHERE commonly referred to as the Barth mechanism (Barth and Hildebrand, 1961; see the review by Bates, 1981). Here the symbols O and O2 refer to oxygen atoms and molecules in their fundamental states 3 P and 3 Σ, respectively. The green line emission provides a useful means of deducing the atomic oxygen density near 100 km, as shown for example by Slanger and Black (1977).

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