Analysis of ion densities in the vicinity of space vehicles - Ion-neutral chemical kinetics

Physics

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Earth Orbital Environments, Ionic Reactions, Neutral Particles, Reaction Kinetics, Space Plasmas, Spacecraft Charging, Charge Transfer, Ionization Cross Sections

Scientific paper

Recent laboratory studies of ion-molecule reactions relevant to the analysis of ion densities in the vicinity of space vehicles in low-earth orbit are discussed. The studies include new cross section measurements of the important O(+) + H2O charge transfer collisions and the H3O(+)-producing charge-transfer reaction rate is found to be less collision-energy dependent than previously assumed, whereas the H3O(+)-producing reaction rate is highest at thermal energies and decreases rapidly with increasing collision energy. Implications of the results on previous interpretations and recent space observations are discussed.

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