Abstract
The principle of operation of drift tubes and their application to the determination of ion-neutral reaction rate coefficients, k, as a function of the ion/reactant molecule (Er) and the ion/buffer gas (Eb) centre-of-mass energies are discussed. It is shown that drift tube data of k versus Er, for atomic ion/neutral reactions can be used with confidence in modelling the ion chemistry of shocked interstellar gas. However, it is stressed that drift tube data relating to molecular ion reactions must be used with caution since internal excitation of the ions can occur in collisions with the buffer gas. Some consideration is given to the variation with Eb and Er of the rate coefficients, k3, for ternary association reactions and to the relevance of the data in estimating radiative association rate coefficients appropriate to shocked interstellar gas.
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Smith, D., Adams, N.G. (1988). Drift Tube Studies of Ion-Neutral Reactions and Their Relevance to Interstellar Chemistry. In: Millar, T.J., Williams, D.A. (eds) Rate Coefficients in Astrochemistry. Astrophysics and Space Science Library, vol 146. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3007-0_10
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DOI: https://doi.org/10.1007/978-94-009-3007-0_10
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