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By Guy P. Brasseur, Susan Solomon

"[…] an engaging 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 procedures which continue 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)

Example text

Reactive uptake of a gas-phase molecule by a liquid particle. 68b) Γsurf = cX kdes represent the effects of bulk and surface reactions, respectively. In these expressions, HX is the Henry’s law coefficient which relates the equilibrium concentration of molecule X in the gas phase to the concentration of the same species in the liquid phase. R is the gas constant, T is the temperature, and ks is the first-order loss rate coefficient for molecule X on the surface of the particle. 5 , where a is the radius of the particles, accounts for the sphericity of the particles.

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. C. Ramsperger, Theories of unimolecular gas reactions at low pressures. J Am Chem Soc: 49, 1617, 1927. , Mass transport considerations pertinent to aqueous-phase reactions of gases in liquid-water clouds, in Chemistry of Multiphase Atmospheric Systems.

If chemistry is much faster than transport for that particular species, then the direct effects of transport can be neglected to a first approximation. This will be discussed in more detail in Chapters 3 and 5. 28) where kb represents the reaction rate constant (expressed in cm3 molec−1 s−1 for a two body reaction). 30) where the rate coefficient is now expressed in cm6 molec−2 s−1 . Very often, one of the reactants is not directly involved in forming the reaction products, but assists in promoting the reaction by transferring energy through collisions with the other reactants.

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