Repulsive interactions of closed-shell ions with Ar, Kr, and Xe atoms: Comparison of beam and transport measurements

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Abstract
Measurements of repulsive interactions of closed-shell alkali and halogen ions with Ar, Kr, and Xe atoms by ion-beam scattering are compared with measurements of ion mobility and diffusion in drift tubes at high electric field strengths. Both measurements probe the repulsive interaction and have a region of overlap which can be tested for consistency. The transport data are generally consistent with the ion-beam measurements, but the latter should probably not be analyzed as a single exponential repulsion, which ignores the effects of attraction at larger separations. As a by-product, generalized Einstein relations for calculating ion diffusion coefficients from measured mobilities are found to give good agreement with direct measurements.