Mobilities and longitudinal diffusion coefficients for Li+ ions in Ar, Kr, and Xe at room temperature

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Abstract
The mobility of Li+ ions has been measured in Ar, Kr, and Xe at room temperature over the E/N range 6–218 Td in Ar, 8–216 Td in Kr, and 8–228 Td in Xe using a drift tube without mass spectrometer. The pressures used were 0.3–2.0 Torr for argon and 0.5–2.0 Torr for krypton and xenon. It is found that mobilities can be deduced from arrival time spectra which have been affected by reactions. The zero‐field reduced mobilities are found to be 4.56±0.05 cm2/V s for Ar, 3.65±0.04 cm2/V s for Kr, and 2.77±0.03 cm2/V s for Xe. These mobility values are higher than the Langevin values by 2.3%, 4.9%, and 3.4%, respectively. The longitudinal diffusion coefficients were also measured and compared with values calculated using the generalized Einstein relations and the present mobility data. The experimental values are somewhat higher than the calculations in all cases.