Longitudinal diffusion of K+ ions in He, Ne, Ar, H2, NO, O2, CO2, N2, and CO

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Abstract
Longitudinal diffusion coefficients, measured with a drift tube mass spectrometer, are reported for potassium ions in helium, neon, hydrogen, nitric oxide, oxygen, and carbon dioxide for E/N in the range 1−700 Td (E is the electric field strength, N the neutral gas number density, and 1 Td = 10−17 V⋅cm2). These results, together with those previously reported for potassium ions in argon, nitrogen, and carbon monoxide, are compared with the theories of Wannier and of Mason, Whealton, and Viehland, which relate mobilities and diffusion coefficients.