By H.S.W. Massey (Eds.)
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Extra info for Applied Atomic Collision Physics. Atmospheric Physics and Chemistry
5 1 10 i | M v 2 (eV) Fig. 8. Cross section for the reaction 0 + + N 2 - > N O + + N as a function of relative velocity v. For applications to the thermosphere under conditions in which there are no significant relative drift motions between the ions and neutral gas atoms, the appropriate reaction rate will be given by (29), with f(v) = 4n-1/2y3,2v2Qxp(-yv2l (30a) H. S. W. Massey 48 where ,M, M. eff " M;Mn ' (30b) Tj, Tn being the respective temperatures of the ions and gas atoms, and Mj, M n their masses.
Threshold frequencies for formation of different ions are indicated. V. Penetration of Different Wavelengths into the Atmosphere Figure 4 shows the altitude in the atmosphere at which radiations of different wavelengths are reduced to e~l of their incident intensity. Indications are given of the main absorbing atoms or molecules in different wavelength regions. The data shown are derived from measured absorption coefficients and a typical model atmosphere. VI. , XY + + e ► X + Y. (17) Although the nature of this process is readily understood in a qualitative way and the order of magnitude of the rate coefficient can be estimated, the actual rate of any particular process, and especially its variation with electron and ion temperature, depends very much on the detailed shapes of potential energy curves for XY and XY + .
Adding the smaller direct N signal at 14 amu gives the ambient concentration of N. Two further AE satellites, AED and AEE, carrying similar payloads, have been launched successfully. As we shall see, the remarkable range of observations which can be made with these automated laboratories in space makes it possible not only to check the validity of photochemical theory but also, through consistency requirements, to throw light on the accuracy of laboratory measurement of reaction rates and even to derive values for some reaction rates difficult to measure in the laboratory.