Measurement of the Rate Coefficients for the Bimolecular and Termolecular Charge Transfer Reactions of He₂⁺ with Ne, Ar, N₂, CO, CO₂, and CH₄ Page: 2
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and a rather profound understanding of these processes
has developed. Conversely, the reactions of ions of
little importance to earthlike or planetary atmospheres
have received proportionally less attention. Only re-
cently have the successes in using charge transfer
mechanisms to pump high-energy lasers refocussed interest
onto the reactions of non-atmospheric ions. It is the
study and quantitative measurement of the characteristic
rates of reactions for one such ion, He+ that is the
subject of the work reported here.
In 1947, Bates and Massey^" initiated the modern in-
terest in charge transfer reactions by suggesting that
atomic ions such as 0+, produced in the upper atmosphere
of the earth through photoionization of (or 0) by
solar ultraviolet radiation, might be interacting with
other neutral atoms and molecules by charge transfer.
In general it was found that the loss of the photoions
follows the pattern that charge transfer reactions con-
vert the primary ions to species which can be more readily
lost by recombination than could the original atomic ions.
For example, in the region near 300 Km where the dominant
ion is 0 , the reactions,
0+ + N2 + N0+ + N (1.1)
0+ + 02 0+ + 0 (1.2)
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Lee, Francis Wha-Pyo. Measurement of the Rate Coefficients for the Bimolecular and Termolecular Charge Transfer Reactions of He₂⁺ with Ne, Ar, N₂, CO, CO₂, and CH₄, dissertation, May 1977; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc331306/m1/11/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .