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Their rate of production is certainly < 10% of that for the charge exchange reaction. Similarly, for the 0 2 reaction no quenching could be observed and was certainly < 10% of the total. Rowe et al. (1980) measured the rates of the same two reactions using a flow drift tube and obtained results agreeing very well with those of Johnsen and Biondi. VIII. Application of Laboratory Data to Photochemistry of the Main Ionosphere We now discuss the application of laboratory data to the chemistry of the main ionosphere, bearing in mind the uncertainties still associated with such matters as the importance of vibrational excitation in affecting reaction rates and the inadequacy of experimental and theoretical data on reaction rates involving metastable atoms.

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 + .

For this purpose it is necessary to know not only the total cross sections ßi and Qt but the partial cross sections of which they are comprised, in other words, the cross sections for processes which leave the ion in different excited states. Thus, with O atoms in the ground 3 S state, the following processes are possible provided the quantum energy is high enough: 0(3S) + /iv ► 0 + ( 4 S) + e, (10a) + 2 (10b) + 2 (10c) 0 ( D) + e, 0 ( P) + e. In these cases, the 0 + is left in one or other of the terms arising from the ground configuration.

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