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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 elemental radiative, dynamical and photochemical techniques which retain it. (Bulletin American Meteorological Society)

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Extra resources for Aeronomy of the middle atmosphere: chemistry and physics of the stratosphere and mesosphere, Third Edition

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94 for Q3 . , 1993). , 1978). Note that the hydroxyl airglow reduces the amount of energy potentially available for heat from the exothermic reaction between ozone and atomic hydrogen. , 1998) and the (OH rotational) temperature near the mesopause (Viereck and Deehr, 1989; Lowe and Turnbull, 1995). Emissions from N (2 D) and N (2 P) are particularly important in the aurora, where they are produced primarily through photoelectron impact on N2 (see Chapter 5 and 7). , 1980). The fluorescence of NO in the γ bands represents a useful method of NO measurement in the lower thermosphere, as first pointed out by Barth (1966).

Thus its probability is relatively low, which is reflected in a time constant for radiative decay of almost an hour. Similarly, the cross section for production of O2 (1 ∆g ) by photon absorption from the ground state 1 O2 (3 Σ− g ) + hν → O2 ( ∆g ) is small. 1 21 Thermodynamic Considerations Enthalpy, Entropy, and Free Energy The basic principles governing the reactivity of chemical substances lie in the thermodynamic properties of these species. In order to evaluate the feasibility of chemical processes, the enthalpy of reaction must be examined.

Are not always the stoichoimetric coefficients a, b, c, . . as shown by laboratory experiments. Different experimental methods have been developed to derive reaction rates, but will not be presented here. The parameters describing the kinetics of the reactions are generally derived by measuring the concentration of the reactants or products as a function of time. The rate of change of a reactant or of a product is related to the rate of reaction R (molec cm−3 s−1 ) by 1 d(B) 1 d(M) 1 d(N) 1 d(A) =− = ...

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