By H.S.W. Massey (Eds.)
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These results suggest that under certain conditions in flow drift tube experiments, Teff given by Eq. (28a) is significant in determining the vibrational as well as translational temperature and that the variation of the reaction rate with Teff above 1000 K is due mainly to vibrational excitation. It is not possible to say, however, how general these conclusions are, based as they are on a single reaction only. Further reactions of major importance are those between N 2 and O, N2+ + o ► NO+ + N, ► o+ + N 2 , (35a) (35b) which have been studied experimentally by McFarland et al.
This has major consequences for the structure of the ionosphere. After this we discuss first the processes by which electrons are lost through direct recombination to ions. This is not sufficient for a full understanding of the processes which lead to production of an equilibrium concentration of electrons at F1 region altitude during the day. Ionic reactions, which we next discuss, play a very important role, as we shall see. Applications of atomic collision data to the F x region and later to F 2 are then described.
37) Although it cannot be assumed that all the ions are formed either in the ground state or in the 2 D state, Johnsen and Biondi obtained strong evidence that the production of 0 + ( 2 P ) is negligible. Thus they found that the measured reaction rate was the same whether the ions were produced from (37) or by electron impact at an energy below the threshold for 0 + ( 2 P ) production. The mobilities of the excited ions were also the same with both sources. Furthermore, it was found that when H 2 was added, a strong production of HeH + was observed.