Abstract
Progress over the past five years in the measurement of rate coefficients and cross sections for interactions between positive ions and neutral molecules of particular interest to aeronomy is reviewed. Emphasis is placed on the methods of experimentation developed for studies in the range of thermal energies and slightly above. Along with discussion of the range of applicability of each of the techniques, illustrated by examples of measurements on processes of aeronomic interest, some evaluation of limitations of applicability and reliability of the measurements is made. A table summarizing results obtained to date on processes pertaining to the atmospheres of the earth and neighboring planets is presented.

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