By Guy P. Brasseur, Susan Solomon

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

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

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Predictive possibilities of unimolecular rate theory. J Phys Chem: 83, 114, 1979. S. Deehr, On the interaction between gravity waves and the OH Meinel (6-2) and the O2 atmospheric (0-1) bands in the polar night airglow. J Geophys Res: 94, 5397, 1989. A. Schwarz, Chemical Kinetics. Prentice Hall, 1972. J. F. Boyle, The excitation and collisional deactivation of metastable N2 P atoms in auroras. J Geophys Res: 85, 687, 1980. 1 Introduction The distribution of most chemical species in the middle atmosphere results from the influences of both dynamical and chemical processes.

The Herzberg continuum involves excitation from the ground state to the repulsive A3 Σ+ u state. 7. Typical potential energy curves for a diatomic molecule. 8. Potential energy diagram for the principal states of the oxygen molecule. Adapted from Gilmore (1964). 9. Potential energy curves for a predissociative process in a diatomic molecule. 7, can such a transition lead to dissociation? Dissociation can often occur in such a case through curve crossing onto a predissociating state. 9 presents a corresponding potential energy curve showing this phenomenon.

Exothermic reactions may nevertheless be non-spontaneous. It must be noted that ∆H is a function of temperature. 15K . 15K where T is the temperature and Cp is the heat capacity at constant pressure (cal/deg mol). This correction is generally small over the range of atmospheric temperatures so that the tabulated values can be applied as a first approximation. 22 AERONOMY OF THE MIDDLE ATMOSPHERE Entropy may also influence the spontaneity of chemical reactions. In general terms the entropy represents the disorder or randomness associated with a particular process.

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